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      The societal role of meat—what the science says

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          Abstract

          Eating meat has been the aspiration for an enjoyable and nutritious meal in most cultures and during most times for at least as long as there are written records, and likely far back to the earliest days of our genus some 2 million yr ago. Nonetheless, history also indicates that there has been frequent and prominent advice to abstain from meat or even prohibit its consumption, for cultural, spiritual, nutritional, or economic reasons. The societal debate around the value of meat is neither new nor has it been dispassionate. Science has been a participant in this debate from early on as well. While Pythagorean communities abstained from meat based on reincarnation theories, Aristotle came to the reasoned conclusion based on everything that he knew about 2,300 yr ago: “The tame animals are for the use and nourishment of mankind, while the wild ones, if not all, most of them, are on account of nourishment and help, in order that clothes and other tools come to be from these. And therefore, if nature does nothing in vain or without a purpose, it is necessary that nature made all of these on account of humans” (Aristotle, Politics, 1256b10-22). It is therefore fair for every generation to reask this question considering the best and most recent scientific evidence available: should eating meat in sufficient portions be a common and important part of the standard human diet? This Special Issue of Animal Frontiers aims to provide a synopsis of answers which represent the currently available best scientific evidence. The answers are given on major considerations pertaining to eating meat, including its impact on human nutrition and health, environmental sustainability, economic affordability, and ethical justification. To this end, we invited a broad group of leading international scientists to interpret the scientific evidence for the benefit of making it accessible to the communities of policy makers, industry practitioners, journalists, common consumers, and fellow scientists alike. Our request of the authors was not to reflect on the most granular levels of current scientific argumentation on each of these topics. That would have been impossible and would never do justice to the quality and intensity of these debates within the scientific community. Instead, we asked them to derive what can be robustly learned and has most societal significance, from the scientific evidence as it currently stands. As guest editors of this Special Issue, we wish to emphasize our trust in the value of scientific debate, and in the ongoing questioning and challenging of what may appear as common knowledge or as an established paradigm. Science progresses by asking questions more so than by providing answers. We take Karl Popper’s epistemology as a guide, so that at best, we can know what is not true. Similar principles characterize this Special Issue: we appreciate and ask for debate on how to interpret the scientific evidence; we decidedly reject torturing the data until it confesses to a desired outcome; we want to neither suppress the inherent complexity of the subject; nor do we want to hide behind it. Livestock and Human Health As it is often argued that the eating of meat is justified by its contribution to the nutritional needs of global populations, we felt that this was the first key element that needed to be confronted with scientific evidence. The opening article of this Special Issue, “The role of meat in the human diet: Evolutionary aspects and nutritional value” (Leroy et al., 2023), initiates the discussion with the following questions: 1) is meat indeed to be considered as a meaningful part of the species-adapted diet of humans; 2) are there nutrients that can become compromised when abstaining from meat; 3) how does meat contribute to the supply of these nutrients globally; and 4) which risks may be created by a large reduction in meat consumption? The article demonstrates that Homo sapiens evolved to be persistent and frequent meat eaters, so that it can be assumed that meat is at least compatible with human anatomy and metabolism. Moreover, given that meat represents a high-quality food matrix for digestibility and absorption of a broad spectrum of nutrients, several of which being already limiting factors in diets worldwide, it seems fair to state that the dietary role of meat is not straightforward to replace. In fact, populations that have scant access to meat tend to suffer from the typically expected health problems associated with low intake of specific micronutrients found in meat, or from deficient quality protein intakes. To sum up, the regular consumption of meat appears to bestow multiple and important nutritional benefits. Whereas the above-mentioned arguments speak in favor of some meat consumption, they tell us little about optimal or maximum intake levels. The corresponding question to the health benefits is whether there are also health risks in eating meat (in particular with respect to red and processed meats and their impact on noncommunicable diseases), and at what dosages such risks may be incurred. Experts in this domain took up the challenge in their article “Non-communicable disease risk associated with red and processed meat consumption – Magnitude, certainty, and contextuality of risk” (Johnston et al., 2023). Based on GRADE methodology, the international standard for evidence-based health recommendations, it was concluded that causality assumptions are of low to very-low certainty only. Claims for further meat restriction below the current intake levels are mostly made based on associative correlations obtained from some observational studies, which suffer from potential bias and residual confounding. Such claims are quite open to interpretation and do not seem sufficient to merit strong public policy action. Even if such risks materialize, they would be trivial (from an absolute risk perspective) and depend on interindividual differences, preparation methods, and the quality of the background diet. Because of the heterogeneity in types and degree of processing and the potential concomitant formation of harmful compounds, precaution may be warranted for the intake of processed meats beyond reasonable levels. Taken together, reducing meat consumption may backfire as it could further undermine nutrient security, especially in populations with elevated needs. Livestock and the Environment Apart from the individual health situation, humanity also faces a collective risk. The human species has become so pervasive on Earth, that its activities may be harming biodiversity and the capacity of natural resource cycles (e.g., water, carbon, phosphorus, and nitrogen) to maintain themselves within stable limits. Being mediated naturally, to some extent, via the large resource pools of oceans, atmosphere, natural biosphere, and land surface, these cycles could strongly alter other biological cycles, possibly resulting in rapid climate change or other natural phenomena. Livestock agriculture has its role to play: the animals from which meat (as well as dairy, eggs, hides, manure, etc.) is gained are not only numerous by themselves, but also consume significant amounts of agricultural resources. A crucial question then is whether these livestock systems consume more resources than sustainable circulatory ecosystems can afford. To address this, we asked specialists in the domains of agriculture and (agro-)ecology to provide us with their perspective in their article “Ecosystem management using livestock: embracing diversity and respecting ecological principles” (Thompson et al., 2023). Ultimately, the answer depends on what is the desired end state of an ecosystem. If the aspiration is to return to a state of Nature nearly untouched by Homo, this must be dismissed as illusionary, arbitrary, and arguably impossible. The latter is not only because it is far beyond human technological means, but also because human impact has altered the Earth already so much, that the clock cannot be turned back (assuming there was even a consensus to which time it should be returned: 500, 5,000, or 50,000 yr back). More realistically, an end state should be sought in which the resource cycles can be reasonably stabilized and where today’s remaining biodiversity can be sustained and ideally improved. Such an endeavor will most likely have to include very large tracts of savannah-type landscapes in the temperate climate zone latitudes, neither forested nor deserted, as these were the default setting in which much of today’s biosphere evolved (including Homo sapiens). These landscapes cannot be reinstated without large-scale intervention by (human-managed) ruminant herds. Another argument for the role of animals, both ruminants and monogastrics, is that they are essential to optimize and valorize crop agriculture in food-generating ecosystems. Even if feed–food competition needs to be further mitigated and balanced according to nutritional requirements globally, plant-based production does not only lead to human-edible food, but also large amounts of inedible biomass. Livestock are the most likely viable option to return the nutrients captured in this biomass back into the natural cycle, while producing high-quality human-edible food. Moreover, the amount of crops and the surface they need would have to expand to compensate for reductions in animal-sourced food (and the highly bioavailable nutrients it contains). The outcome of unintended economic, social, and environmental consequences when abandoning livestock could prove catastrophic to the already shaky ecological balance of the resource cycles and the remaining natural capital. In short, human-managed livestock systems must be part of the solution to environmental sustainability. If the above scenario based on the sustainable integration of animal and plant agricultural is a possible desired end state, this next question follows: how much of what type of agriculture and livestock system needs to be practiced where, to achieve optimal land use and a sustainable food system? Further: would such a scenario be capable of producing enough meat to satisfy the potential demand which a global population of soon enough 10 billion people would want to eat, given the nutritional benefits described above? We consulted experts in the more quantitative aspects of food system transformation, and they do not think that this answer can readily be given. In their article “Challenges for the fair attribution of livestock’s environmental impacts: the art of conveying simple messages on complex realities” (Manzano et al., 2023), it is shown that our understanding of the critical resource cycles and pools is still too underdeveloped to estimate the sustainable carrying capacity of the Earth for livestock of all the various species. What we do know with certainty is that the accounting systems that are currently used to describe the impact of livestock systems on the resource cycles have important limitations. This is not necessarily problematic, if these limitations are well acknowledged and reductionist tunnel vision is avoided. At the same time, we should also strive to develop and operationalize better metrics where feasible. This disclaimer applies to all aspects of the natural resource cycle, for instance where the impacts of ruminant’s methane emission on the carbon cycle in the atmosphere and the soils are estimated, where nitrogen cycles are measured or where the water cycles are being evaluated. Little good can be expected from such impact estimations if the accounting systems are not updated to the current state-of-the art knowledge, and if important gaps in empirical knowledge are not swiftly filled with committed research efforts. To achieve the holy grail of holistic, transparent, and fair metrics, scientists from a variety of disciplines and representing a broad range of views and skills need to work together. Livestock and Socioeconomics The first four articles in this special issue cover the basic requirements for ensuring human nutritional and agro-ecosystem health. Meeting these basic requirements will require coordinated effort in the food system value chains and greater capital investments. In 2017, the cheapest price for a basket of food items, including animal-sourced foods, that satisfy the minimum nutrition required by an individual, was around three purchasing power parity adjusted U.S. dollars per person per day in most countries, an amount not affordable to about 40% of the global population. Due to the COVID-19 pandemic, the Ukraine crisis, and strong inflationary forces, this percentage is likely to have increased by 2022. The article “Affordability of meat for global consumers and the need to sustain investment capacity for livestock farmers” (Ederer et al., 2023) maintains that all the long-term health and productivity harms that undernourishment causes, is not only an avoidable human tragedy but also a huge loss in economic opportunity. Expanding animal production output is the most readily available way to nourish the world sufficiently in the future. To achieve this, today’s livestock production processes must become more efficient, leading to more affordable consumer prices of meat, milk, and eggs, which would be a key contribution to making sufficiently nutritious food universally available. Not the only, but one of the key necessary conditions for such a future will be large investments to build livestock food systems that are environmentally sustainable as well as nutritionally adequate. With examples of the judicious policies and widespread adoption of innovative livestock interventions reported on in this issue, farmers, herders, agribusiness, and policy makers shall be inspired that this is feasible. More animals, being produced more cost-effectively, may create ethical challenges for livestock keeping, both during their life in terms of animal welfare, and in the inevitability of their death to supply meat. We therefore must consider the ethical dimensions as well. In their article “Is meat eating morally defensible? Contemporary ethical considerations,” Croney and Swanson (2023) deliberate that the case either for or against meat on ethical grounds purely from the perspective of the animal is weak. Ethicists have been impaling themselves in their debates on philosophical principles for decades without much useful outcome. However, careful ethical analysis shows that if meat is economically required to provide for human health, and as long as substantial portions of the global population cannot access sufficient amounts of meat, then this shortfall has ethical primacy over considerations of the conditions of the animals. As long as there are human mouths to feed with meat and no better alternative in sight, then humans enjoy clear ethical priority over the animal. Is there an alternative looming on the horizon? Over a billion dollars are being invested in creating technologies based on cell culture that promise to be able 1 d to produce a food product equivalent to meat, but without the need to slaughter an animal. The technology is to grow animal cells in a bioreactor, aiming to achieve a similar biological and nutritional outcome as in traditional meat. Doing so at the required scale would obviate the need to grow, feed, and slaughter animals. The promise is also that the environmental burden of its production would be lower than the burden of livestock production. If the assumption is correct that this process will be more cost-effective and have less-environmental impact than today’s livestock systems, then the global nutrient gap could eventually be closed in this way. These assumptions are currently far from realistic, argue Wood et al. (2023) in their article “‘Cellular agriculture’: Current gaps between facts and claims regarding ‘cell-based meat.’” The relevant technologies are not new, and their history of several decades of research as well as remaining technological issues suggests it may take considerable time to overcome the hurdles while it is unclear that the cost can be brought down sufficiently to become a viable economic, nutritional, or environmental alternative to farming animals. Does all this mean that the meat sector requires no changes, and that the global livestock and meat industry may continue as it has all along? That is most unlikely. The twin challenges of closing the global nutrient gap and achieving environmental sustainability are large. More research is needed than ever before, in all aspects of the sciences. This requires dedicated effort across disciplines, and between the sectors of private industry, public policy, governments, and scientific organizations. The Special Issue ends with the article titled: “Challenges and opportunities for defining the role and value of meat in our global society and economy” (Polkinghorne et al., 2023) highlighting examples of success of how more knowledge can be generated faster, and thus deliver much-needed better solutions. The Dublin Declaration of Scientists As part of our overall effort, we formulated The Dublin Declaration of Scientists (The Dublin Declaration of Scientists on the Societal Role of Livestock, 2023). We invite all scientists from around the world to support the Declaration by signing it digitally, and thus give our science a voice that too often is silenced. Instructions for the signature can be found at www.dublin-declaration.org. The last paragraph of the Dublin Declaration was taken from the text of the 2021 UN Food System Summit final documentation on Sustainable Livestock, which we believe is a most appropriate statement to conclude this editorial piece. It reads: “Human civilization has been built on livestock from initiating the bronze-age more than 5000 years ago toward being the bedrock of food security for modern societies today. Livestock is the millennial-long proven method to create healthy nutrition and secure livelihoods, a wisdom deeply embedded in cultural values everywhere. Sustainable livestock will also provide solutions for the additional challenge of today, to stay within the safe operating zone of planet Earth’s boundaries, the only Earth we have.”

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          “Cellular agriculture”: current gaps between facts and claims regarding “cell-based meat”

          Implications There has been a significant increase in the number of scientific articles related to “cell-based meat” (‘CBM’), which is in line with the current interest from the scientific community and consumers, but mainly from investors, food industry, and regulatory bodies. Despite the billions of dollars being invested in “cellular agriculture”, there are significant technical, ethical, regulatory, and commercial challenges to getting these products widely available in the market. In addition, the widespread adoption of such technologies can exacerbate global inequity between affluent and poor individuals and between high- and low-income countries. Current ‘CBM’ products are not identical to the products they aim to replace. First, there is still considerable dissimilarity at the level of sensory, nutritional, and textural properties, while important quality-generating steps in the conversion of muscle into conventional meat are missing. Second, many societal roles of animal production beyond nutrition can be lost, including ecosystem services, co-product benefits, and contributions to livelihoods and cultural meaning. Detailed production procedures are not available, making it impossible to corroborate the many claims related to their product characteristics and sustainability. ‘CBM’ companies arguing that the cost of all technology will eventually be significantly reduced often quote Moore’s law. However, biological systems like ‘CBM’ have natural limits and feedback mechanisms that negate this law. Introduction In alignment with an emerging Silicon Valley–style outlook on the future of food, a bold 2019 report by the think tank RethinkX claimed that by 2030 the U.S. meat and dairy industries would be bankrupt due to “cellular agriculture” taking over their traditional markets (Tubb and Seba, 2019). This claim was based on their view of how quickly precision fermentation and “cell-based meat” (‘CBM’) technology would be developed and scaled, so they could compete on price parity with traditional livestock production (Leroy et al., 2023). However, estimates on future evolutions differ wildly. For example, a 2018 report ordered by the Flemish government predicted that the consumption of “clean meat” may start in approximately 2040 (van Diepen et al., 2018). Ten years ago, however, it was already touted that “clean meat” would be available in the market by 2017 (EC, 2012). By now, it is clear that it is difficult to make predictions and that many technical challenges remain before such products can become commercially available. Nevertheless, over the past few years, billions of dollars have been invested in these technologies related to cellular agriculture (including precision fermentation and CBM) and hundreds of new start-ups have been created around the globe (Boukid and Gagaoua, 2022). The terminology for developed products is still under discussion; for recognizability, we will use the term “cell-based meat”, though the term “meat” imparts characteristics that have not been proven, as we will discuss. The reasons for proposing new protein alternatives, including ‘CBM’, are diverse and divergent, but mainly related to ethical concerns about animal welfare and the possible impact of animal protein production on the environment (Siddiqui et al., 2022). This paper briefly describes the technical, regulatory, and consumer challenges facing both precision fermentation and CBM and examines their potential to disrupt the meat and dairy industries, with a focus on ‘CBM’ as an alternative to farm animal proteins. Precision Fermentation to Engineer Proteins for Dairy and Meat Industries Precision fermentation is the process of engineering the gene sequence for a specific protein into a bacterium or yeast strain and then growing that strain in large-scale fermenters, to produce the required protein. This technology has been used for decades in the biotechnology sector. It was previously referred to as “recombinant protein production” and is used for many vaccines and drugs, such as insulin (Wood and Tavan, 2022). In the food sector, precision fermentation has been used for decades to produce enzymes for cheese making or conventional fermentation. Chymosin, used in cheese manufacturing for milk coagulation, was originally extracted from the stomachs of calves before manufacturers switched to a recombinant form of this enzyme (expressed in a range of organisms). Recently, companies have used this technology to produce key proteins for the food industry. Impossible Foods uses a precision-fermentation form of hemoglobin to give their plant-based burgers the look and smell of red meat when they are cooked. As another example, The Every Company is producing chicken-free egg products using precision fermentation technology. Until now, the major focus has been on dairy products. Around 60% of the companies in the precision fermentation space are focusing on the production of key dairy proteins. Perfect Day was the first company to release a commercial dairy product containing β-lactoglobulin. Other companies are now following their lead. One of the goals for companies like All G Foods and Eden Brew is to recreate a liquid milk, which contains both the whey and casein proteins that are needed to form a micelle, to give this product the full functionality of cow’s milk. These products will still need to have added fats, sugars, minerals, and vitamins to approach the nutritional content of cow’s milk. There has been significant investment in the precision fermentation space and many predictions that this technology is going to disrupt the traditional meat and dairy industries; however, there are many technical, regulatory, and consumer challenges that need to be addressed. The major technical challenge will be the cost of goods, with precision fermentation being significantly more expensive. For milk proteins, a range of yeast strains can produce recombinant proteins at a rate of 10–30 g/l, but these proteins then need to be separated from the yeast cells and cell debris using a variety of downstream processing techniques that can account for up to 60% of the cost of manufacture. Precision fermentation technology will also be critical for the ‘CBM’ sector to produce the various growth factors and perhaps other compounds required to culture mammalian cells. To scale-up precision fermentation, companies use fermenters at >100,000-l capacity, which will require complex engineering and energy intensive processors. In the USA, the regulatory process is relatively straightforward with the ability to use the ‘Generally Recognized As Safe’ classification. In Europe, however, it will be difficult to register precision fermentation products under the current legislative constellation, as they use genetically modified organisms in the manufacturing process. Finally, the labeling of precision fermentation products will vary considerably in different regions, and this has the potential to confuse consumers who are cautious of genetically modified products. Based on these issues, precision fermentation will be unlikely to disrupt the livestock industry but may provide high-value products for niche markets. How Close Does “Cell-Based Meat” Currently Come to Meat? Companies aspire to produce meat without using animals (Figure 1). It is touted that such ‘CBM’ will be the same as meat from farm animal(s). Meat from animals is typically derived from the skeletal muscle of slaughtered animals, though other tissues such as liver and products of the fifth quarter are also consumed, of which the amounts depend on the region in the world and local food cultures. Here, we will focus on meat derived from skeletal muscle. Currently, many hurdles remain to make ‘CBM’ despite several decades of work stemming mainly from the fields of regenerative medicine and monoclonal antibody production. These hurdles have been summarized in Thorrez and Vandenburgh (2019) and still remain. The envisioned production procedures tend to oversimplify the complexity and growth of skeletal muscle. Skeletal muscle is a tissue which is composed of several cell types, the most abundant one being myofibers. Other cell types include connective tissue cells (fibroblasts), fat cells (adipocytes), endothelial cells, and blood cells. The current focus is mainly on the expansion of myoblasts, the precursor cells to myofibers. However, it is still unclear how long cells from biopsies can be expanded, as these primary cells undergo senescence during long-term expansion. Other precursor cell types (e.g., pluripotent cells) are being explored, but the creation of these cells, as well as the efficient differentiation towards myoblasts, currently involves genetic engineering. Figure 1. Simplified schematic representation of how ‘cell-based meat’ is touted to be produced using ‘cellular agriculture’ without rearing animals. Sometimes, the expansion phase is compared to fermentation. However, there is a stark difference between growth rates of bacteria and yeast vs. animal cells. Yeast can expand well over 1000× in less than a day, whereas this takes over 10 days for animal cells. Adding other cell types, in a way that spatially is similar to muscle, involves a co-culture setup, which adds to the complexity. Myoblasts need to fuse to form multi-nucleated myotubes and these myotubes are an intermediate towards myofibers, which occurs in animals during prenatal development. These myotubes are aligned (driven by unidirectional forces between attachments to the bones) and to create a similar alignment for ‘CBM’, manufacturing techniques and edible scaffold materials need to be developed. After birth, the myofibers then grow in volume and contractile strength since the organism is actively using them. The properties of muscle from fetuses and newborns (which seldomly is consumed) are vastly different from the muscle of adult animals. Building up proteins from the contractile apparatus, which are characteristics for skeletal muscle, requires the prolonged stimulation of muscle. Such stimulation is not currently accounted for and will require bioreactor development which will significantly increase the envisioned production time. As there is no product nor protocol available, most of the claims related to the production of ‘CBM’ in view of sustainability improvements (e.g., energy or water use) seem not scientifically substantiated or remain at best speculative, especially for its environmental footprint (Lynch and Pierrehumbert, 2019; Rodríguez Escobar et al., 2021). Manufacturing challenge for cell-based meat The ‘CBM’ products are not commercialized because the current industrial production is still not economically viable due to the high production costs as well as lack of regulatory framework. In fact, one of the greatest challenges facing the scaling of ‘CBM’ manufacturing is the cost of goods for these products. This is driven primarily by the cost of the culture media, the need for high quality facilities, and the capital cost for sophisticated manufacturing facilities. The biotechnology industry has been using cell-based systems for the manufacture of monoclonal antibody therapeutics for several decades and this is an expensive technology. The use of serum-free media is standard but more expensive than the use of serum, due to the cost of the recombinant growth factors. With ‘CBM’, the final product of cell culture will be the cells themselves, which can be used as a cell slurry or induced to undergo muscle fibers differentiation. Once this step has occurred, the cells will be exceedingly difficult to handle, and this part of the manufacturing process is yet to be fully described. Many ‘CBM’ companies are claiming that the costs will be dramatically reduced using large-scale bioreactors at up to a 250,000-l scale. However, the only product registered so far is produced at a 5-l scale, so validating these systems at scale will be a major challenge. In addition, the use of antibiotics will not be permitted, and these larger scale fermentations will require around 90-days continuous sterile culture. Another claim is that ‘CBM’ manufacturing will not require the level of biosecurity used in the biopharma industry, yet most of these quality requirements are driven by the need to maintain sterile systems. The cost of large-scale ‘CBM’ facilities has been estimated at $600M U.S. and the depreciation costs of these facilities will be a major component of the final cost of goods. While interesting, other technology that is being developed for ‘CBM,’ like edible cell-scaffolds and 3D printing with multiple cell types, just add to the challenge of scaling and cost of goods. The development of blended products with plant-based material will help to reduce costs and stabilize formulation. Some companies are focusing on culturing fat cells, with the view that they will only need to add 5% of these cells to their formulations to give the product the hint of meat. Proponents of CBM frequently use the concept of Moore’s Law, the idea that the cost of production for new technologies decreases exponentially over time, to argue that this will also be the case with CBM. However, while Moore’s law has been predictive with the cost of production for physical technologies like computers and high-throughput omics methods, it has never been applied to a biological system due to the complexity of the biological events and mechanisms underpinning cell growth. Nutritional challenges for cell-based products At present, despite the claims of companies, such products are not ready for the market. To the best of our knowledge, only one lab-based food product is registered (in Singapore) and has been temporarily available in very limited quantities. In addition, production protocols are not available for independent testing by academics or regulatory agencies (Figure 2). Therefore, any claims related to nutritional content cannot be verified as such. Indeed, much remains to be inferred based on available research-scale protocols, as was conceptually analyzed by Fraeye et al. (2020). Sensory properties of meat such as texture, color, and flavor can perhaps be adjusted with food engineering techniques to create products with similar appearance to meat. However, the use of these products in downstream cooking applications may be limited as these characteristics may change during further processing steps such as heating and interaction with other ingredients. It is much harder to make statements related to nutritional characteristics, although these products can be suitable for people having adverse reactions to peas, soy, and gluten. Meat contains highly digestible proteins with essential amino acids, vitamins, and minerals (see elsewhere in this Special Issue). However, while nutrients can be added to meat replacement products, the cost (both in economic and sustainability terms) of this is unknown. Moreover, simply adding components may lead to a different bioavailability, for example, the extent and rate by which they are absorbed by the body. Figure 2. Summary of the remaining challenges and questions related to the future of ‘cell-based meat’ (‘CBM’). Regulatory and Consumer Issues Related to “Cell-Based Meat” Consumption As described by Chriki et al. (2022), an important question pertains to the legal nature of ‘CBM’: is it really meat? According to the American Meat Science Association (Boler and Woerner, 2017), the European regulation (Annex I of Regulation No. 853/2004), and other legal definitions (Ong et al., 2020), meat comes from a part (muscles and/or edible tissues) of an animal consumed as food. Therefore, ‘CBM’ does not currently qualify as meat except if we consider living cells as part of an animal (Ong et al., 2020). To be considered meat, ‘CBM’ must be sourced from an animal, proven to be safe for consumption, and be similar in composition, nutritional value, and sensory quality to meat from farmed animals, which is not yet the case (Boler and Woerner, 2017). In addition, to consider ‘CBM’ as a novel food (within EU legislation) means that it should be safe and properly labeled, so as not to mislead consumers. From a biological point of view, meat is the final product of aged muscle through a maturation process (a well-known process by butchers), just as wine originates from grape juice through winemaking. The current cellular agriculture process, however, produces muscle fibers/cells and not meat. Therefore, consumers who are familiar with what meat represents within their culinary and agricultural legacies tend to decline calling it “meat”, unlike vegan activists who see it as a welcome strategy to eliminate meat from the food system and, therefore, wish to give it maximum market potential by capturing the meat category (Gousset et al., 2022). Additionally, various societal roles of animal production beyond nutrition can be lost in the process. This includes the many ecosystem services offered by livestock, the generation of edible and non-edible co-products (e.g., hides, wool, manure, draught power, serum, blood, and fats), contributions to livelihoods, and the generation of cultural meaning. Finally, still from a societal perspective, it has been argued that ‘CBM’ may exacerbate global inequity, including increased economic disparity between regions (Mahoney, 2022). The technology risks being under the control of multinational corporations (based on patents and high technological, economic, and legal entry barriers), may lead to the creation of luxury foods, and cause a further expansion of food deserts (Mahoney, 2022). When conducting surveys in view of market acceptability, answers are often inconsistent (Gousset et al., 2022). This is not entirely unexpected, as consumers are being asked about a product which does not yet exist, with the exception of Singapore. In addition, most may not know what ‘CBM’ is and confuse it with any other type of artificial meat (e.g., plant-based imitations). Willingness to “try the product” and willingness to “consume it regularly” are also often confounded. Indeed, many respondents would like to taste the product once for curiosity, which does not mean they would consume it regularly for varied reasons. Therefore, the acceptability of ‘CBM’ is often overestimated because it is based on willingness to try, and not on intentions to eat ‘CBM’ regularly. Many surveys confirm that respondents who express a high acceptance tend to be young, urban, and highly educated at least in some major countries but not all, possess little factual knowledge about ‘CBM’ production, and are already inclined to reduce meat consumption (for a variety of reasons including concerns about animal welfare and environmental issues). Conversely, older, and less urban consumers are more reluctant and express concerns about the future of the countryside, livestock farming, and landscape and pastures. Such consumers also highlight the unnaturalness and low healthiness of the product and express a higher emotional resistance. In any case, willingness to pay is low overall, since most respondents (68% in France, 71% in Brazil, and 86% in China) were willing to pay less for ‘CBM’ compared to conventional meat (Ellies-Oury et al., 2022). All these motives and barriers may differ from country to country with barriers being stronger in those regions holding stronger traditional values and motives being stronger where the challenges related to food demand are the greatest, such as in Asia and Africa. Conclusions “Cellular agriculture”, including ‘CBM’ and precision fermentation, has been promoted as an alternative for producing future food proteins by replacing dairy and meat without involving animals. The development of such novel technologies, despite several ethical concerns, is accompanied by a multitude of research reports, the creation of start-ups, massive investments, and prominent media coverage. It has evolved into a hot topic for societal debates, often associated with divergent opinions. Currently, however, these new food products are not available for consumption in meaningful amounts, nor are they exposed to independent evaluation on economic or scientific grounds. Indeed, the multitude of technical challenges related to the scalability and production of ‘CBM’ prototypes are not available for accurate and independent assessment in terms of their sustainability, intrinsic (sensory, nutritional, and technological attributes) or extrinsic quality. The perception of unnaturalness and the low or poor cultural acceptance by consumers, mainly because of lack of familiarity and uncertainties about the aesthetics, are other barriers to societal acceptance. Therefore, they are well perceived only by a certain category of people (niche market or animal activist groups). The other drawbacks of these products are the limited data on the long-term human health implications (safety and health), environmental impact (although they claim less land usage), and obscure risks related with cellular engineering. Streamlined regulatory measures and continued basic research, free of conflicts of interest, are necessary to fuel product innovation, set forth requirements for appropriate monitoring of these innovative technologies, and to promote such novel foods while simultaneously ensuring both consumer safety/acceptability and guaranteeing low environmental impact. Finally, we believe that the need for more proteins to feed the world’s growing population will continue to be the main driver of innovation in the production of proteins and meat alternatives. We must keep in mind, however, that most of the growth in population will be in developing countries. Thus, major challenges that need to be further considered in the development of such novel foods from “cellular agriculture” origin will be their price and distribution logistics as well as how they are situated in a fair and affordable food equity framework.
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            Ecosystem management using livestock: embracing diversity and respecting ecological principles

            Implications Agricultural land is a scarce resource globally and will continue to encounter challenges to sustainably increase food production in the face of global change. Adaptations that make use of livestock should ideally incorporate agroecological principles (e.g., improved circularity), while limiting feed-food competition. However, they should also remain respectful of the diversity of ecosystem contexts, availability of resources, and the various social and economic needs of local populations. Herbivores are a natural constituent of the world’s ecosystems and have played a key role in the last several million years. As the numbers of wild herbivores have greatly decreased, largely due to human action, the maintenance of such roles depends on the practice of adequate livestock management. This is the ecological basis for sustainable livestock. Well-managed animals function as an integral and productive part of agricultural systems. Among other outcomes, they can convert massive quantities of nonedible biomass (inevitably arising from pasture systems and from growing plants into human food), recycle plant nutrients back to the land, sequester carbon, improve soil health, and offer many ecosystem services. To optimize both environmental impact and food supply, the broad and underutilized diversity that is inherent to livestock systems should be mobilized instead of being suppressed. This diversity can, for instance, be observed in terms of species and breeds, but also in terms of production methods and management strategies. Introduction The animal production sector is facing important challenges in the context of global change. This is especially related to population growth, land erosion, a decrease in biodiversity, wastage of water, depletion of resources, disruption of nutrient cycles and eutrophication, and climate change. Even if livestock agriculture has contributed to these problems, as have other forms of human productivity, it can contribute to the solution, provided it operates within an agroecological framework and environmental boundaries, while still respecting primordial principles of diversity (Leroy et al., 2022). The latter relates not only to the biological variety of livestock options as such, but also to the important heterogeneity within ecosystem types, production and management methods, and local needs and resources. Indeed, livestock products and production systems differ, from intensive to extensive, from arctic to tropical, from highly technological to indigenous, or from being a by-product to being the main focus of the system. Definitions vary, but there are >40 farmed animal species and >7,000 breeds adaptive to specific local needs and context (FAO, 2021). They produce a vast range of foods and services for humans, from diets that are largely inedible for humans. Only a small share of this bounty of diversity is utilized to its full potential, which makes it a valuable resource pool for solutions (UNFSS, 2021). Turning that biological diversity to the ecological context in which the animals are deployed, combined with a proper set of adapted management strategies, will be of utmost importance. In addition, various innovations have the potential to further open new solution spaces, as is the case for precision livestock farming, genetics, feed, robotics, environmental monitoring, and business models (UNFSS, 2021). Livestock can already provide almost half of our global protein requirements while staying within key planetary boundaries (Van Zanten et al., 2018), and more innovation will increase this share even further (Mottet et al., 2018). But besides bringing in protein of higher quality than when derived from plants, animal-source foods also contain highly bioavailable micronutrients that are often difficult to obtain from crops (see elsewhere in this Special Issue; Leroy et al., 2023). Below, we will outline the importance of 1) the variability of the ecological context in which livestock systems operate, and how this can both constrain and stimulate the potential of animal production, 2) the need to factor in agro-ecological principles, such as improved circularity and minimized feed-food competition, and 3) the positive ecosystem contributions of well-managed livestock and how these are affected by management strategies. The Importance of Ecological 
Context and Diversity The role of livestock in the world’s terrestrial ecosystems has been negatively impacted by the dominant views on “Nature” as landscapes predominantly devoid of human influence (Bond, 2019). As a result, many environmentalists are advocating for an intensification of human activities in ecosystems that have been heavily modified, while completely abandoning human activities in lands suitable for ecological restoration – the so-called “land sparing” approach. Such an approach naturally promotes the abandonment of vast lands used by sustainable livestock management, as they are typically considered to have low production potential and high biodiversity and ecosystem functionality. In recent decades, however, substantial evidence from specialized fields is contesting such views (Manzano-Baena and Salguero-Herrera, 2018). All continents, except for Antarctica, have been significantly affected by human activities. These regions hosted a significant amount of megafauna, which became extinct outside Africa and South Asia only some thousands of years ago. Naïve animals, not used to people, were easy prey for humans expanding beyond their previous range, which added to technological advances in hunting and climate fluctuations. These extinctions would have had a more dramatic effect on ecosystems than what we see today. But the human activities that followed had a similar action as herbivores on landscapes, namely through the use of fire. Evidence from Africa shows how megafauna kept landscapes open by efficiently consuming massive quantities of vegetation, especially by seasonal migrations that follow the peaks in plant productivity. These seasonal migrations achieve herbivore densities that are well above the ones observed in temperate protected areas, constrained by surrounding human development. Large herbivore migrations are also assumed to have facilitated the formation of deep organic soils that are now used by some of the most productive crop production systems worldwide. Moreover, elephants are known to tumble down trees and have a particularly important influence in keeping woody vegetation at bay. According to data from national parks where herbivore migrations are still possible, current baseline levels of herbivore densities in Africa are large – and often equivalent to livestock densities under local ranching practices. Such high herbivore levels typified many other parts of the world before the megafauna disappeared, but livestock has kept a high herbivore pressure in the ecosystems (Manzano et al., 2023a). In these contexts, the reduction of ruminants leads to the invasion of deep tap rooted woody species that have deleterious effects on ecological function. Hunter-gatherers use fires to contain woody vegetation and promote grassy biomass, increasing the productivity of the ecosystem and the availability of prey. Pastoralists also use fire to increase fodder availability for livestock, while targeted specialized management utilizes animals such as goats to contain and even revert shrub spread, whereas livestock mobility achieves a high degree of efficiency in plant matter use. Their movement allows them to follow plant growth across vast landscapes, and it thereby also increases the quality of fresh forage intake. The resulting landscapes (Figure 1) of all three scenarios – shaped by either megafauna, hunter-gatherers, or livestock keepers – achieves a similar landscape structure of mixed tree groves, shrubs, and open pasture that, except for rainforests, has dominated the planet’s surface since the late Miocene, 12 million years ago. With most plants and dependent animals exposed under the sun during this entire time, biodiversity has adapted to it. Many plant species in biodiverse pastures require considerable amounts of light to survive (Eskelinen et al., 2022), and depend on ecological processes that disturb and contain closed-canopy vegetation. Figure 1. Images of Open Ecosystems (Bond, 2019) dominated by wild herbivores (top left: Cabañeros National Park, Spain; bottom left: Maasai Mara conservancies, Kenya), and of cultural landscapes displaying a similar vegetation structure but that are dominated by domestic herbivores (top right: Conquense Drove Road at Almagro, Spain; bottom right: dehesa in Cordoba municipality, Spain). Pictures’ author: Pablo Manzano. Megafauna is no longer available in Central European, Eastern North American, or East Asian landscapes, so that their abandonment leads to biodiversity losses and the collapse of some high nature value ecosystems, as has been observed in southern Fennoscandia. Once open ecosystems are assumed to be natural (Figure 2), the introduction of extant African and South Asian megafaunal species could be considered as an ecological restoration strategy. But this is no longer viable in contemporary societies because of landscape fragmentation, the presence of infrastructures that render migration impossible, and the high costs of human-wildlife conflict. With adequate management, however, livestock production can provide these important ecosystem services, even if constrained by impacts of human development on the landscape. The necessity of sustainable productive activities to maintain important ecosystem processes, supported by increasing evidence from ecological science (Plieninger et al., 2014; Manzano-Baena and Salguero-Herrera, 2018), reinforces the alternative “land sharing” approach previously advocated for by rural development, human rights, and Indigenous peoples’ advocates. Figure 2. Map of conventionally assumed biomes, defined either as treeless areas or closed canopy forests (Olson et al., 2001), with overlapping areas that display alternative stable states, otherwise defined as Open Ecosystems (Bond, 2019). Map source: Manzano et al. (2023a). The Need to Factor in Agroecology, Circularity, and Feed-food Competition Traditionally, livestock systems were used to create nutrient rich-food from low opportunity cost feed material. Ruminants were tasked to create food from inedible fodder, whereas monogastrics were fed undesired by-products, such as the residues of potatoes or other types of food-waste. High-productivity livestock systems, however, are increasingly reliant on additional support from feed crops grown on arable land, which engenders feed-food competition (Mottet et al., 2017). The agroecological potential of livestock primarily relates to the fact that they are able to upcycle copious quantities of nonedible biomass into nutritious foods, while also recycling plant nutrients back to the land, improving soil health, and sequestering carbon (see the next section, below). As such, they are intrinsically connected to sustainable crop agriculture. The purpose of the latter is to generate biomass from plants, of which only a part is suitable for harvest and subsequent production of human food. Even if agricultural innovations have massively increased the volume of biomass produced annually, as well as its subfractions suitable for harvest, most of this output is still nonedible and must ideally be recirculated in view of soil fertility (where animals come in as helpful). Cultivation of wheat and corn, for instance, is highly efficient in the generation of material for harvest compared to nonedible aboveground biomass (e.g., straw), but the ratio remains at 1:1. Other plants cultures show even higher proportions of nonedible biomass (legume seeds, up to 2:1; rape seed, 3:1; sunflower, 4:1). In addition, considerable amounts of nonedible biomass are generated as by-products during food processing, of which the proportion of total inputs ranges between 20% (e.g., intensive milling) and 60% (e.g., production of rape seed oil). While such by-products may still contain human-edible subfractions, they are usually discarded because of technological or economic reasons. Further nonedible biomass arises from inclusion of “green fertilizers” (e.g., use of clover-grass mixtures or alfalfa into the crop rotation systems of organic farming). This practice increases soil fertility but also blocks cultivation of crops at least every fifth year, hence increasing the direct nonedible biomass from arable land by 20% at the expense of human edible food production. Whereas monogastric animals are particularly useful for the efficient conversion of human-inedible by-products from crops, ruminants also have the capacity to make use of grasslands. The latter not only provides a vast source of nonedible biomass but can often also not be converted into arable land (e.g., due to topographical or climatic reasons). Pasture-based production systems, such as grass-fed beef and dairy cattle, thus convert an inedible material for humans into a consumable form of protein. Often this land is unsuitable for arable farming and therefore this form of meat and milk production has no opportunity for direct food production through cropping. Globally, grasslands represent 70% of the total agricultural area, but even in areas with intensive arable farming, considerable proportions of grasslands can be found (e.g., 30% in Germany). Summing up arable land and grassland, the ratio of nonhuman edible to human-edible biomass accounts for at least 3:1, provided that no green fertilizers nor other green biomass for feeding purposes is grown on arable land. The ratio observed in practice is at least 4:1 in areas where intensive arable farming is practiced (Wirsenius, 2000; GOALSciences, 2022). Globally, the fact that animals utilize forage and crop residues fits the estimate that 86% of global livestock feed does not compete with human food (Mottet et al., 2017). Obviously, there is still room for improvement within the remaining 14%, in view of further reductions of food-feed competition. It needs to be considered, however, that even for the human-edible part of the feed, animals can function as a buffer for surpluses or for crops that are in principle edible but have been discarded because they did not sufficiently meet quality standards. Circularity of inevitably occurring, nonedible biomass, and the plant nutrients bound therein (nitrogen, phosphorus) is essential to maintain fertility of agricultural areas. Unless they are left to rot (with often negative consequences on the ecosystem), this may be achieved only through conversion of nonedible biomass into storable organic fertilizers and targeted application to the plants. Two conversion routes are feasible: fermentation in biogas plants ending up in biogas residues or feeding to livestock producing human food as well as manure which is recycled back onto the cropped area in most cases. It is only through livestock that the provision of organic fertilizers will also generate the additional bonus of high-quality human food. Based on the ecological rationale of circularity, corresponding emissions cannot be attributed to livestock production only. They would also be generated by the inevitably occurring nonedible biomass that would be either left to rot or would be routed to biogas production instead, when not fed to livestock. The same applies to arable land, water, energy, etc., that was consumed during generation of the edible counterpart of the nonedible biomass. Methane released by ruminants during digestion of nonedible feed materials makes a specific difference to the other two pathways of recirculation. Since atmospheric methane is quickly degraded to CO2, its long-term effect on global warming is limited, provided ruminant numbers (or their total methane emissions) do not increase (see elsewhere in this Special Issue; Manzano et al., 2023b). On the other hand, conversion of inevitably occurring, nonedible biomass to high quality human food runs without food competition and is most efficient with ruminants. Taken together, inclusion of livestock into agricultural systems is an efficient driver of circularity. Removing livestock from the system would dissipate the generation of human food from nonedible biomass. Such a system would significantly expand the consumption of resources (land, water, energy) as well as of emissions per nutritional unit (kilocalories, protein, etc.) (van Zanten et al., 2018). Indeed, current high-productivity livestock systems are reliant on intensive production of feed on arable land, thereby charging the environment and climate. But these unfavorable consequences of how intensive livestock production is currently managed, do not justify complete abstinence from livestock. The minimum impact of agricultural production of human food on environment and climate may be found in mixed systems, where livestock production is based on inevitably occurring, nonedible biomass. More circular systems will likely result in smaller and more diverse herd sizes and potentially also a lower output of animal-source foods, even though the latter comes with large uncertainty because some pastoral and agroecological management systems can be remarkably productive (cf., the relatively high stocking rates needed for adaptive grazing). Key to this philosophy is placing livestock where it is most appropriate from a climate, system, and management perspective, thus having an impact on all sustainability indicators. Positive Ecosystem Contributions of 
Well-managed Livestock and the Link 
with Management Today, much of the discussion on the impact of livestock on the environment commonly focuses on the production of methane, via reticulo-rumen fermentation from ruminant species, leading to a myopic approach to improving the environmental impact of food production. However, the positive impact of livestock on other ecosystem services and as tools to manage and improve the land we rely on for food production can often get overlooked or minimized. One such regulating service is livestock’s impact on soil health and carbon sequestration, particularly in soils that have a legacy of mismanagement. Soil carbon sequestration from livestock production is commonly left out of the greenhouse gas assessments, but in a review of the literature, Cusack et al. (2021) identified soil carbon sequestration as having the largest potential to reduce beef emissions globally, both per unit of product and per unit of land. The potential for carbon sequestration comes via two key mechanisms: 1) restoration of degraded landscapes through the introduction of livestock, and 2) use of adaptive grazing to improve ecological function (Rowntree et al., 2020; Sanderson et al., 2020; Teague and Kreuter, 2020; Grandin, 2022). Landscape restoration is of particular importance today, considering the legacy of mismanagement found in most soils under agricultural management across the globe (Lal, 2003). These soil losses have occurred primarily in cropping systems and due to overgrazing. Sanderman et al. (2017) estimated that 133 Pg (Petagram) of carbon has been lost in the top 2 m of soil globally due to agriculture. Current and historical farming and ranching practices have aided in this loss of soil carbon due to its growing reliance in past decades on simple annual crop rotations, synthetic inputs, and extractive practices (Lal, 2004). As a result of these practices, soil health and quality have been reduced, along with agricultural outputs from those landscapes. In addition, farmers/ranchers’ reliance on external inputs has increased to keep their operations productive. However, research has indicated that through the introduction of perennial forages, reducing tillage and incorporating livestock, soil carbon can be restored, and overall ecosystem function improved 
(Lal, 2004; Rowntree et al., 2020; Teague and Kreuter, 2020). This loss/sequestration of carbon is rarely associated and counted when crop products are compared to livestock systems. Adaptive grazing management is a nonprescriptive outcome-based approach to grazing management that aims at keeping soil covered, thereby minimizing disturbance (including via overgrazing), minimizing synthetic inputs, and increasing plant diversity. Additionally, management is typically centered on appropriate timing of short-duration, high-intensity grazing events, meanwhile leaving adequate plant residue for plant recovery. The impetus of this management style more closely mimics the natural behavior of grazing animals across landscapes where sporadic, but concentrated and uniform forage utilization is typical. By doing so, plants are allowed adequate time to recover between grazing events, keeping them and their root systems healthy. Additionally, this maintains plants in an active state of regrowth longer, increases solar energy capture, and aids in the cycling of above ground nutrients back into the soil via the physical trampling of plant material and through urine and fecal deposition. Implementation of such management has been observed in numerous studies to improve soil health and water holding capacity, reduce external input requirements, increase soil carbon sequestration, and partially offset the environmental impact of production, amongst numerous other benefits (Teague et al., 2011; Machmuller et al., 2015; Rowntree et al., 2020). As important as carbon sequestration in grass and rangelands is for the mitigation of environmental damage, it is also paramount that the protection of the carbon that is already stored is safeguarded and that natural ecosystems are kept intact. Globally, permanent grass and rangelands are under threat of conversion into marginal cropping systems or other land uses. In the United States, fueled by ethanol incentives, approximately 3 million ha of grass and rangeland was converted to cropping systems between 2008 and 2012, with the USDA estimating that 960,000 ha of rangeland alone was lost between 2007 and 2015 (Lark et al., 2015; USDA, 2018). These grass and rangelands provide numerous ecosystem services, including wildlife habitat, recreation, and food production, to name a few, and they are often considered to be at a long-term equilibrium for soil carbon (when healthy). Their soils play a critical role in the regulation of global carbon cycling through long-term carbon storage. It is estimated that, globally, grassland and rangeland soils store approximately 20% of soil organic carbon (Conant, 2012). In these arid and semi-arid environments, a key driver to the loss of soil carbon is disturbance from tillage, overgrazing, or urban expansion. This land conversion serves as a significant carbon source to the atmosphere, along with increasing soil and other nutrient losses (Spawn et al., 2019; Zhang et al., 2021). In the United States, Spawn et al. (2019) estimated that cropland expansion into grasslands resulted in a 38.8 MMTC (million metric tons of CO2) yr−1 emitted from 2008 to 2012. Similar annual emissions were observed by Yu et al. (2019) from 1980 to 2016. Furthermore, Zhang et al. (2021) simulated the conversion of grassland to crop production in the Midwestern United States and estimated that soil erosion was increased by ~8% annually, and that nitrogen loss increased by ~4%. These losses have impacts beyond anthropogenic emissions, such as sedimentation and eutrophication of waterways that reduce water quality for humans and aquatic ecosystems. The new cropland produced from the land conversion is, typically, of marginal quality as well. The new cropland has a yield deficit of 6.5% of the United States average and has negative impacts on plant and animal biodiversity (Lark et al., 2015). Therefore, while some of these soils may have saturated soil organic carbon stocks, management that protects against degradation/conversion provides significant value by producing high-quality, nutritious human-edible products, protecting the stored carbon from being lost, and protecting natural ecosystems. Conclusion Environmental protection of ecological resources and commercial livestock management are not a contradiction. On the contrary, the one necessitates the other. Commercial livestock management depends on the sustainable provision of ecological resources of water, biodiversity, feeding grounds, and crop land production. At the same time, except for the very few remaining untouched wilderness areas of the world, ecological management towards environmental protection of these resources requires active human management. Livestock are an indispensable instrument in such management to create and sustain the multiple circular flow of materials in the soils, water bodies, and atmosphere.
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              Affordability of meat for global consumers and the need to sustain investment capacity for livestock farmers

              Implications All livestock species are in their own respective ways a key pillar of the global food system, by economic, social, and cultural values. The most frequent, but by no means the only valuable purpose, is to provide meat for food. Meat is a nearly indispensable nutrient-dense food to global consumers. While many nutrients in meat are of key importance, protein offers itself as a sentinel proxy for the analysis. Depending on which assumptions one makes, there is either no gap in global protein supply for human nutrition, or protein supply needs to be expanded by around 80% over current levels to meet all nutritional needs of the global citizenship. Given global demographics until 2050, the same assumptions make the difference between whether global protein supply needs to grow only by a manageable 20% or need to increase by about 150% over today. Independent of whether a protein (and nutrients) gap exists or not, in 2017 a minimum nutritional adequate food basket was financially out of reach for three billion people in the world, or 37% of the total population. This percentage is likely to have risen by 2022. The situation is mostly driven by the high costs for protein and other nutrients rich foods. The quantity and affordability gap calls for an expansion of production of all protein and nutrient-dense sources, including from animals such as meats, dairy, eggs, and fish, and at more affordable prices to the final consumer. Significant investments in livestock production systems are required, especially in lower-income countries. Investment conditions in these countries are, however, poor due to high levels of debt, weak and fragmented institutional capacity, weakly developed commercial markets, and low supply of human capital, all of which exacerbate the challenge. Application-oriented research and concerted strategic actions have proven to be successful tools to raise investment levels in livestock production systems and making them economically, socially, and environmentally sustainable. Livestock farming holds good potential for increasing food security and improved environmental performance, which also applies as much to smallholders. Smallholder’s current often poor productivity is not caused by their size, but by a lack of coordinated sectoral strategy and a lack of capital investment. When combined with innovative business models and nationally aligned policies, smallholder farming thrives on all performance dimensions, ecologically, culturally, socially, and environmentally. Introduction It is estimated that global livestock production accounts for 40% of the total agricultural GDP (Salmon et al., 2020). Using the World Bank/FAOStat share of 4.3% of agricultural value added in global GDP in 2021, and IMF’s forecast of the global economy being USD 104 trillion in 2022 (current USD), this makes the global livestock sector a USD 1.8 trillion industry in 2022, of which meat comprises around two-thirds (dairy and eggs the other third) (World Bank; IMF, 2022). In terms of final consumer expenditure, animal-sourced foods including fish cost 7.0 trillion 2018 purchasing-power-parity-adjusted (PPP) USD on the global retail counter, or around 12% of the world’s total (value added of restaurants not included; World Bank, 2022; GOALSciences, 2023). Animal husbandry, including all meat-producing animals, comprises much more than these bare GDP and consumption numbers suggest. According to the World Farmers Organisation, livestock is the most frequent kind of private capital ownership in the world, and more often for women than men. Especially in Africa and South Asia, home to 800 million bovines and thus almost half of that species global stock, animals are a financial asset providing diverse instruments for insurance and credit. They are also fundamental to the educational, cultural, and social contexts of societies. Grazing animals provide essential biodiversity and ecosystem services described elsewhere in this issue (Thompson et al., 2023). Beyond the commercial value of foods and fibers derived from these animals, they also provide important economic shadow benefits. Given its significant role in the nutritional food matrix as described elsewhere in this issue (Leroy et al., 2023), meat foods are an essential component of building and maintaining human capital for the economic function of a society. In short, meat plays a leading role in achieving a prosperous and sustainable future, both economically and environmentally, while contributing much to the livelihoods and social well-being of citizens across the globe in many dimensions. This article examines four questions to dissect the economics of meat. First, in terms of nutrition, a key role of meat is to contribute bioavailable proteins and other essential nutrients. We will look at how much meat is available to the global citizenship, and whether these are sufficient amounts considering protein requirements (treating protein as the sentinel nutrient, in recognition that meats provide many different nutrients). Second, what does it cost those citizens to purchase this meat, also relative to other sources of key nutrients? Related to that, how affordable are meats to different sections of the global citizenship, and consequently, how many persons in the world can or cannot afford a nutritionally adequate diet? The third question asks which pathways exist to raise investment into livestock production, so that not only more can be produced (if that is desired), but also so that it becomes more affordable and is environmentally and socially sustainable. Here the well-proven tools of R&D and policy coordination are highlighted. The fourth question concerns the role of smallholder livestock farming which is the prevalent form of the production system in those regions where the essential nutrition gap is the largest and where the sociocultural dimensions are also the most prominent. Additionally, examples showcase how the smallholder system can be made more productive while preserving its multidimensional role in the socioeconomic texture of communities. How Much Meat is Available to the Global Consumer, and Does it Meet the Global Nutritional Requirements? The answer to this question informs whether and how much more livestock production might be required. The answer is also very much contested, which seems in some part due to the many ways in which it can be measured, and in some part due to the emotionally charged debate around meat consumption. Rather than being able to introduce empirical clarity, the advent of modern sciences may have fanned the controversy. For instance, the German biochemist Justus van Liebig (1803–1873), an early pioneer in the nutrition sciences, promoted proteins as the “only true nutrient” and successfully commercialized the world’s first industrially produced meat replacement product (globally famous Liebig’s Extract of Meat, produced in Uruguay). Controversy followed almost instantly. Notions of a global protein deficiency have been widely debated since the 1930s and led to various public policy actions and industrial innovation in both directions, to either increase or decrease meat production, with both movements claiming science to be firmly on their side (IPES-Food, 2022). The measurement problems are manifold. Availability is not equal to actual consumption, and the latter is difficult to estimate on an aggregated scale. Also, the availability of meat products per country per year masks uneven distribution across socioeconomic segments of society and across climatic seasons. An average seemingly sufficient availability per country per year almost certainly implies severe shortages for some segments of society during some periods of the year. Meats contain a variety of essential nutrients, some of which can also be supplied by other foods, some not, and some act complementary to each other. Furthermore, even after nearly two centuries of research on the topic, the nutritional sciences still do not agree on a narrow range of what is an optimal amount of supply for such nutrients—not even for protein—so that “sufficiency” has widely divergent meanings to arguing protagonists in the public debate. This is not the place to repeat the nutritional debate, but from an economics perspective, it is relevant to establish whether there is a shortage or not, and on what main factors this would depend. The following will outline the possible answer in scenarios and is framed in the unit of protein content of foods, not because this is the only relevant nutrient, but because it provides a reasonable basis of comparison among the food groups. Figure 1 A) describes the supply of proteins to six different income groups of countries around the world from each of the major food groups. The global average supply amounts to 82 g of protein per capita per day (pc/pd). The high-income countries and China each reach 105 g pc/pd, while low-income countries reach 58 g pc/pd. The composition of protein sources varies widely among the groups. Where in high-income countries, animal-sourced foods contribute 66% of all proteins, it is 38% in China and 17% in low-income countries. Figure 1. Sources of protein in gram per capita per day, average per inhabitant of country income group. Income groups are defined as per World Bank classification. Total population in billion per income group in brackets. Data source is GOALSciences (2023), calculations based on FAOStat Food Balance Sheets, reference year 2018, retrieved in January 2022. (A) It shows standard protein content as per FAOStat. (B) It shows protein content adjusted for bioavailability with DIASS scores (based on Marinangelli 2017). The calculations of these values are explained in more detail at GOALSciences (GOALSciences, 2023), and are based on the FAOStat food balance sheets (https://www.fao.org/faostat/en/#data/FBS) which is the only consistently measured source of primary data on that subject that exists anywhere. One feature of the FAOStat data is that they describe availability to the consumer, and not intake. Between supply of the food and the stomach, much can happen. The food might be wasted in the retail logistics chain and not make it to the consumer. At the consumer, the food may rot in the kitchen, become leftovers on the plate, or be fed to pets. Culinary preparation with high heat or hard processing may destroy some or all the proteins and nutrients. How much of these wastes is occurring has been based on rather rough estimations based on sparse incidental analysis in the past. Only in January 2022, the much-awaited Global Dietary Database (GDD, Global Dietary Database, 2022) released a massive statistical effort to distill from more than 1500 observation studies a global and country-by-country estimate of dietary intakes. For the global average consumer, the GDD estimates total protein intake to be 64 g pc/pd. Compared to an average supply of 82 g pc/pd, this would imply a protein food waste ratio of 21%. For our scenarios, we consider waste ratios of 10%, 15%, and 20% between supply and intake (the often-quoted claim that one-third of all food is wasted (FAO, 2013), includes waste during harvesting and processing as well, which are accounted for by FAOStat in their supply figures therefore the scenarios are only 10%, 15%, 20%). The other main constraint is the uneven supply across socio-demographic strata and climatic seasons. Different incomes, cultures, and behaviors within a country can lead to different typical diets with large variations in protein and nutrient content. In the lower-income countries, seasonal availability of foods also makes a difference. Therefore, to supply most of the population with enough protein most of the time requires an oversupply on average. Here too, the amount of necessary oversupply is essentially guesswork. We assumed 10%, 20%, or 30% for the scenarios. The question of nutritional sufficiency has many answers. The first is to agree on what is the optimal amount of proteins in a nutritiously adequate diet. Relative to an average daily diet of 2330 kcal per person (and for our purpose disregarding all necessary nuances between males and females, the young, adult, and old, the healthy and ill, and the pregnant, lactating, or reproductive-intentioned), the US/EU recommended daily allowances suggest that 64 g pc/pd is sufficient. Researchers analyzing the least-cost healthy food baskets assumed 75 g pc/pd, or 12.8% of the caloric intake to come from proteins (see further below). Epidemiological evidence from the globally most representative and thoroughly conducted prospective PURE-study suggests 17% of the caloric intake, or 100 g pc/pd (Dehghan et al., 2017). Several popular diets such as ketogenic, Atkins, or paleo diets recommend protein shares of up to 35%. For our scenarios, we chose the two values of 75- and 100-grams pc/pd. Finally, there is the issue of protein digestibility, for instance as expressed by the DIAAS score, whereby the source of protein is adjusted for a bioavailability index. Generally speaking, animal-sourced foods appear to have higher bioavailability to humans than plant-based sources. There is more detail on this subject elsewhere in this issue (Leroy et al., 2023). Figure 1 B shows the protein supply adjusted by DIAAS-scores per country income group. The result of the scenario analysis in Figure 2 shows the dilemma for policy making. Depending on the assumptions, the outcomes range from there being no protein deficiency at all, towards a need to increase supply by 78%—or in numbers, out of a total of 409,000 kilotons of a currently required protein supply, only 229,000 kilotons would be available. The same assumptions then also drive the future scenarios to the year 2050. The answer could lie between a manageable necessary increase of just 18% more supply until 2050, or a need to multiply supply by almost factor 2.5× until 2050 to provide sufficient protein for everybody—depending on which assumptions one prefers, and in each case assuming that waste and demographic/climatic unevenness would not grow proportionally with additional supply. Figure 2. Different scenarios for estimating the global protein gap for 2018 (black numbers on the left half) and for 2050 (red numbers on the right half, then assuming global population of 9.9 billion). The table shows 40 different scenarios. Two scenario clusters are driven by whether the Recommended Daily Allowance (RDA) is either 75 g per capita per day (green, top half), or whether it is 100 g pc/pd (blue, bottom half). The next scenario cluster are assumptions on how much waste needs to be accounted for, whether 0%, 10%, 15%, or 20% (increasing darker shade). The third scenario cluster are assumptions of how much oversupply is necessary to account for uneven sociodemographic or seasonal distribution, whether 10%, 20% or, 30%. With maximum assumptions, the world would need 1.78× more protein in 2018, and 2.36× more in the year 2050 over current supply. With minimum assumptions, the world’s population is sufficiently supplied with protein in 2018, and needs only 18% more until 2050. Source: GOALSciences (2023), calculations based on FAOStat Food Balance Sheet data. The implications for the livestock sector of these scenarios are similarly large. On the one end of the scenarios, the examples of large protein supply with vegetables and pulses in China and India ( Figures 1 A and B) would show that on a global scale there is enough underexploited potential to expand these categories, so that the livestock industry might not need to grow at all, to meet global demand until 2050. On the other end of the scenarios, it could reasonably be argued that the global livestock sector needs to at least double its output to close the nutrient gap until 2050, even if plants and fish resources were much expanded as well. The perception of a significant gap in nutrient supply triggers high investments in alternative meat production technologies, for instance cell-based cultures or precision fermentation. However, they are unlikely to contribute much to the solution in the foreseeable future, as argued elsewhere in this issue (Wood et al., 2023). The Affordability of Adequate Nutrition to the Global Consumer Various concepts exist to measure affordability. In the most recent, and so far, largest data analysis effort, a group of authors has been publishing the cost of a nutritionally adequate diet (CoNA-diet) or the cost of a healthy diet (CoHD-diet) to different income segments of a global society on a country-by-country basis (Herforth et al., 2020, 2022; Bai et al., 2022; Mahrt et al., 2022). Detailed data results based on these studies are easily accessible on the just launched interactive map display tool www.foodsystemsdashboard.org. Those investigations relied on the uniquely and only recently created ICP dataset of the World Bank, which records price data for final consumer items for most countries around the world in 2017, including for all major food products. For the first time, this data allows a detailed and robust comparison of consumer prices for specific food items across the world. Herforth et al constructed a standardized daily food basket consisting of food group reference foods of 322 g of dry rice, 270–400 g of vegetables, 230–300 g of fruits, 210 g of eggs, 85 g of dry beans, and 34 g of oil, which would provide 2330 kilocalories, of which 12.8% (or 75 g pc/pd) are proteins, and then costed these items with the World Bank data. Country by country these reference foods would be replaced by locally common least cost items in the same food category, for instance other grains instead of rice for starchy staples, or other animal-sourced foods instead of eggs. Overall, the analysis yields that in 2017, 37% of the global population could not afford a daily healthy meal, on the assumption that food should not cost more than 52% of income. That amounts to a total of about 3 billion people, of which nearly 1 billion are from India. Three billion people is equal to the global population in the year 1960. This number masks large variation. For the 26 countries whose food systems are classified as “Rural and Traditional” the number is 78%, whereas in “Industrialized and Consolidated” food systems the number is 2% ( Figure 3 ). Figure 3. Share of population who cannot afford a healthy diet in 2017. (A) By country income group. Income groups are defined as per World Bank classification. (B) By characterization of food systems. Source for the data is www.foodsystemsdashboard.org retrieved in September 2022, which is based on Herforth et al. (2022) and Bai et al. (2022). Population is in billion in brackets; population figures do not add up to total global population because some countries are missing (in particular low-income countries). The numbers also reveal the pitfall of considering the average supply of proteins for sufficiency. Even though mainland China supplies on average 105 g of proteins pc/pd on average, there are still 14% of the Chinese population, who cannot afford a healthy basket of foods. Upper middle-income countries supply 89 g of protein pc/pd on average, but 20% of their population cannot afford nutritious meals. Across all countries, the least cost of a healthy diet is mostly around 3 PPP USD per day. A mere energy-sufficient diet costs only around 1 PPP USD per day ( Figure 4 ). It is the high-quality nutrients that drive up the cost of healthy food, not the quantity of energy supplied by carbohydrate-rich foods, such as sugars and starchy staples. Figure 4. Daily cost of a merely energy-sufficient diet per person (blue bars) and a healthy diet per person (orange dots/line) per country, in PPP adjusted USD. 168 countries are shown, but only selected countries are named in the legend. Countries are arranged by cost of healthy diet, from left as the most expensive (Japan shown) to the right of least expensive (Australia shown). The daily cost of healthy diet fluctuates around 3 PPP USD in most countries, whereas the cost for a merely energy-sufficient diet is less than 1 PPP USD in most countries. Source for the data is www.foodsystemsdashboard.org retrieved in September 2022, which is based on Herforth et al. (2022) and Bai et al. (2022). Using the same ICP data from the World Bank, we calculated the costs of food on a per-10-gram DIAAS (bioavailability)-adjusted protein content basis (for instance, we took the price of meat and applied this price to its bioavailable-adjusted protein content to make the food groups comparable with each other, since they have different protein densities and different bioavailabilities). We used World Bank’s PPP adjustment for the food category, which is different from overall country GDP PPP values. In this way, we accounted for the typical situation that food products in countries (especially lower income ones) are relatively cheaper compared to other consumption categories, and thus more affordable. (In lower-income countries the difference between GDP PPP and food PPP can be up to factor 2; therefore, our PPP USD is not directly comparable to the PPP USD of Herforth et al.) Figure 5 shows that broadly speaking, on this basis the food groups have similar consumer prices across the different country income groups. Some items strike out. Fish is much more expensive in high-income countries compared to everywhere else in the world. Dairy products are the most affordable in high-income countries, and become significantly more expensive, the poorer the country is. The highest PPP cost for dairy is in India, which at the same time is most reliant on it for its protein supply. On a bioavailable protein basis, the starchy staples are mostly more expensive than the poultry meats, which shines a new light on the food/feed discussion and upcycling of low-quality foods to higher-quality foods through animals (as poultry feeds on these same starchy staples). At first sight, the most affordable source of bioavailable proteins are pulses and nuts. However, this view does not consider that pulses have high culinary preparation costs. Pulses contain toxic lectins and other problematic compounds and, depending on the heat source, must be cooked for a long time (up to 2 h) to become edible. Especially in lower-income countries, such cost of preparation adds considerable cost and would exacerbate the firewood problem for the environment. Pulses also require expensive storage conditions for year-round supply while meat can be harvested at any time of the year (Ngigi, 2022). Figure 7 illustrates visually the challenge in form of physical mass flows of protein in the global food system for each of the different country income groups. Figure 5. PPP (food)-adjusted retail price in USD per 10 g bioavailability-adjusted protein content in a food group item by country income groups. Income groups are defined as per World Bank classification. Protein content is derived from FAOStat Food Balance Sheets, data retrieved in January 2022. Bioavailability is adjusted with DIAAS scores (based on Marinangelli 2017, same values as in Figure 1). Retail price data and PPP for food are derived from World Bank ICP data (there only available upon application and for scientific purposes only). Calculations performed by GOALSciences (2023). Figure 6. PPP (food)-adjusted retail price in USD per 10 g bioavailability-adjusted protein content of the actually available food by country income groups. Income groups are defined as per World Bank classification. Protein content of food available is derived from FAOStat Food Balance Sheets, data retrieved in January 2022. Bioavailability is adjusted with DIAAS scores (based on Marinangelli (2017) same values as in Figure 1). Retail price data and PPP for food are derived from World Bank ICP data (there only available upon application and for scientific purposes only). Calculations performed by GOALSciences (2023). Figure 7. Mass flow balances of protein content from agricultural production via processing and animals towards food supply. Each flow in proportional size to each other. Excerpts from PLANET food system explorer of GOALSciences: https://goalsciences.org/planet-food-system-explorer Calculations for the year 2019. While Figure 5 shows the cost of each protein, Figure 6 shows the cost composition of the basket of what consumers actually buy (i.e., what they buy is represented by the values of Figure 1 B). Multiplying these out, yields that consumers around the world pay roughly the same for their bioavailable protein, namely around PPP (food) USD 0.40/10 g of protein. The significant difference between countries is not their cost of nutrition, but that poorer consumers cannot afford to buy enough of them. Overall, the conclusion from these analyses is that whether there exists a global protein and nutrient gap or not, is a question of the assumptions about nutritional sufficiency one prefers to make. What is fairly certain, however, is that already in 2017, around one-third of the global population could not afford to buy a sufficiently nutritious meal. With the covid-19 pandemic, the Ukraine crisis and strong inflationary pressures arising in 2022, this percentage is likely to have increased by 2022. As the global population is set to grow from 8 billion in 2022 to 10 billion in 2050, and the increase occurring primarily in the lower-income segments, the affordability gap is likely to grow further. While that may sound like an urgent call to reduce the cost of bioavailable proteins and other essential nutrients, and possibly also to increase the amount of such protein and nutrients availability, the challenge is driven by multiple layers of interlocking dimensions, and not easily resolved. Certainly, the challenge has not gone unnoticed. The massive 2022 joint research report by FAO, IFAD, UNICEF, WFP, and WHO on the topic is called: “The State of Food Security and Nutrition in the World, Repurposing Food and Agricultural Policies to Make Healthy Diets More Affordable.” (FAO, 2022). A key outcome of the report is that many regions in the world need more animal-sourced foods. The Economics of Farming in General, and Livestock Farming in Particular When the poor cannot afford to nourish themselves, then they must degrade the quality of their food intake to the point of harming their health. Lower health status erodes their economic potential, preventing them from increasing their income. The vicious cycle extends to the whole society struck by poverty. Lower-income countries or impoverished communities within higher-income countries cannot take advantage of their lower factor costs of land and labor because their agricultural systems typically have low productivity. The underlying reason is lack of capital investment in all aspects of agriculture, including livestock management, because ultimately there is not enough human capital. How can this vicious cycle be broken? Studying the average balance sheet and profitability statement of an Australian livestock farm illustrates a key part of the challenge ( Table 1 ). Australia is a good example, because the Australian livestock industry is globally recognized for being among the least distorted by national subsidies, and at the same time achieving the highest degree of export competitiveness compared to other countries. Table 1. Average financial performance of broadacre farms in Australia, data for three seasonal years. Source: https://www.agriculture.gov.au/abares/research-topics/surveys/farm-performance, retrieved in September 2022. All values in Australian Dollar. Averages per farm 2019–2020 2020–2021p 2021–2022y Sample of 1412 broadacre farms Total cash receipts $594,370 $699,800 $842,000 − Total cash costs $437,180 $491,900 $565,000 = Farm cash income $157,190 $207,800 $278,000 + Change in trading stocks −$31,780 $25,500 $39,000 − Depreciation & family labor $132,580 $132,700 $134,000 = Farm business profit −$7,170 $100,600 $183,000 + Finance costs $40,990 $40,990 $42,000 = Profit at full equity $33,820 $141,500 $225,000 ÷ Total farm capital value $6,789,180 $7,336,200 $7,788,000 = Rate of return 0.5% 1.9% 2.9% Sample of 868 sheep and beef farms Total cash receipts $434,680 $477,000 $533,000 − Total cash costs $335,540 $346,400 $370,000 = Farm cash income $99,140 $130,600 $163,000 + Change in trading stocks −$46,920 $14,000 $36,000 − Depreciation & family labor $107,840 $107,300 $108,000 = Farm business profit −$55,520 $37,300 $91,000 + Finance costs $25,830 $25,100 $26,000 = Profit at full equity -$29,790 $62,400 $117,000 ÷ Total farm capital value $6,023,740 $6,470,300 $6,768,000 = Rate of return −0.5% 1.0% 1.7% Even in what is considered to be a top-ranked performing livestock industry in the world, and in what is considered to be a good year for Australian livestock farmers, the investment rate of return on capital, is merely 2% in 2021. In 2019, it was even negative, the long-term average hovers around 1%. These numbers are not an Australian peculiarity. The core economics are more or less the same across the world, even if local circumstances of subsidy schemes, market situations and labor resources create lots of variation. This begs the question, of why any entrepreneur or investor should be spending their capital, time, and effort on what seems to be an inherently and structurally unsound business proposal, such as livestock farming. Why do farmers do this to themselves, if they could take the capital and invest in practically anything else which will yield better returns? The question points to the fact that livestock farming is not only about immediate and short-term measurable economic returns. Agricultural economics is peculiar, and this is not the place to highlight all its particular dynamics. In short, since farmers are commodity producers with no pricing power and de facto unlimited competition, their average achievable market price will always be competed down to variable cost, leaving little to no return to capital. At the same time, any structural financial advantage ends up in an increased value of the land as the primary capital component. As a result of this dynamic, the often-stated request of “more income to the farmers” is too simplistic and will not achieve much. Structural increases in prices obtained by farmers make their land more expensive and thus depress real returns to capital back down. However, farmers are of course also not short-sighted. If that 1% rate of return was all there is to their efforts, then they would not be in the business of producing food. For the global farmer, regardless of size and structure, to produce food in light of those low investment returns, they need an agreement with society that makes farming worth their while through other benefits. Such an agreement is informally operative in practically all high-productivity jurisdictions. The core part of the agreement is that the farmers must have ultra-secure title to the land on which they are operating. They own this land for themselves and for all future generations, and only under the most limited circumstances will this land or its utilization rights be taken from them. This secure title provides the farmer with another route of capital return, namely land value appreciation. As society becomes wealthier, and as the land produces more food thanks to increased amounts of investment, the land becomes more valuable. Where and when such an agreement has not been operating, for instance in the fiefdom-based systems of the European Middle Ages, or under communist regimes until the 1980s, or across much of today’s Africa, then food production is suppressed, because investments remain too low. When a high-productivity farmer owns a lot of land under such a societal agreement, then land value appreciation provides much leverage for wealth creation. It is a special kind of financial return because it cannot easily be liquidated. If the land is sold and the wealth is realized into cash, then not only is the land gone for good, but the farmer also loses both the source of their working income as well as the lifestyle that goes with it. It may not be everybody’s idea of a good agreement, and it does not need to be. If there are enough farmers who find this an attractive proposal, then society has enough food. The societal land “agreement” may then be reinforced with additional societal measures, such as explicit or implicit guarantees that there will be off-take markets that will under all circumstances buy everything which the farmer produces. The nature of these off-take guarantees can vary a lot, ranging from purely private cooperative arrangements to explicit state guarantees, but in one way or the other, the institutional framework of a society is always somehow directly or indirectly involved. Food production is so important to society that the sector usually operates de facto as a public utility. As a consequence, the farming sector (at least in those jurisdictions where productivity has priority) usually receives an overproportional amount of political attention, and typically receives a basket of various societal privileges (preferential tax treatments, subsidies, special legal rights, high reputational standing, etc.), which is sometimes welcomed and sometimes maligned, but which is always due to the elementary significance of food production, and the irreplaceable need to have enough farmers being willing to produce such food in light of structurally low investment returns. In livestock farming, all the above forces are exacerbated. A livestock farmer has much capital tied up in a living animal that could easily die or get stolen, and which needs constant daily attention, all of which gives this business an even riskier profile than typical plant farming on land. Livestock farmers, therefore need even stronger societal or communal guarantees of full ownership rights to their animals (and the lands that support the animals, where land is needed) and guarantees for off-take markets that are usually covering their costs. Otherwise, the farmer will not invest, the animal will not exist, animal-sourced foods will not be available, and neither will be the numerous other ecological and socio-cultural benefits of livestock farming. Societies or communities which for whatever reason are not willing or not capable of providing these guarantees for land or animals, will therefore have fewer farmers producing enough surplus food, and therefore less of such food is available to society relative to the purchasing power of the population. This dynamic is reinforced the more agronomically demanding the food is, which means the more investment it requires, and therefore applies especially to all the high-value protein kinds of food, including and in particular, livestock farming. To highlight the necessity of economic sustainability of farming to be on the same standing as environmental and social sustainability for food production, the Scientific Council of the World Farmers Organisation developed an evaluation framework of SAFER Foods—towards Sufficient, Affordable, Farm-anchored, Ethical and Regenerative Diets and Food Production Systems ( Figure 8 ), (World Farmers Organisation, 2020). Figure 8. Scientific Council of World Farmers Organisation, SAFER Foods concept launched for discussion in 2020. Source: https://www.wfo-oma.org/wp-content/uploads/2021/02/WFO_SAFER-Foods-for-a-Sustainable-World.pdf How to Raise the Investment Capacity of Global Livestock Farmers, Especially in Lower-income Countries In contrast to plant-based nutrient-rich food production from pulses, vegetables, or fruits, all of which are agronomically demanding crops, livestock has the advantage that with its wide variety of different species and production systems, it can be more easily adapted into utilizing almost any eco-system, and it can better deal with climate volatility within these eco-systems. At its extremes, camels made civilization possible in hot and dry deserts, and reindeer enabled cultures far north of the Arctic circle where plant-based agriculture is not feasible. It is this ecological flexibility that plant-based protein producers do not have, which is one reason that livestock farming should be an attractive proposition to public food security policy. The global agriculture and health authorities, such as FAO, OIE, UNWFP, WHO, IFAD, and the global research organization CGIAR are much in alignment with the need to build on livestock production systems in lower-income countries, and to do so in line with environmental and social sustainability requirements. Multiple initiatives have been launched in recent years to facilitate scientific evidence of various kinds as a guidance to the necessary policy initiatives. One of them is the ILRI-hosted website and related projects by the Global Livestock Advocacy for Development (GLAD): https://whylivestockmatter.org/. Among other things, the website features a newly launched 2022 series of 7 briefs on livestock pathways to 2030: https://whylivestockmatter.org/livestock-pathways-2030-one-health. Another initiative is the highly active Global Agenda for Sustainable Livestock (GASL) which brings together key actors from private industry, policy, science, and international institutions to create solution spaces: http://www.livestockdialogue.org/. Another related global community is also Livestock Data for Decision (LD4D): https://www.livestockdata.org/ld4d-members. In recognition of the importance of livestock, the FAO Committee on Agriculture instituted a new subcommittee on livestock which began operation in 2022. The highest levels of global policy communiques on how to develop the livestock sector have been issued on an almost yearly basis. For instance, in 2012 the global institutions of AU-IBAR, ASEAN, BMGF, FAO, IFAD, ILRI, World Bank, and OIE announced “A new global alliance for a safer, fairer and more sustainable livestock sector” (AU-IBAR, 2012), in 2016 the UN Committee on World Food Security issued a UN recommendation of the role of livestock on food and nutritional security: “Sustainable Agricultural Development for Food Security and Nutrition, Including the Role of Livestock” (CFS, 2016), in 2018 the Global Forum for Food and Agriculture Communique of the world’s agricultural ministers published “Shaping the Future of Livestock—sustainably, responsibly, efficiently” (GFFA, 2018), and in 2019 ILRI and WEF jointly created: “Options for the livestock sector in developing and emerging economies to 2030 and beyond. Meat: The Future Series” (World Economic Forum, 2019). In the 2021 United Nations Food Systems Summit, the role of the solution cluster “Sustainable Livestock” was particularly recognized, and the subject received substantial engagement from stakeholders. The common theme throughout all these initiatives is twofold: 1) research and 2) concerted strategic action. Sustained and problem-solving oriented research in livestock breeds and production practices has repeatedly shown to have very high societal rates of return. For instance, 45 years of research effort by ILRI, the International Livestock Research Institute, cohosted by the Governments of Kenya and Ethiopia focusing on livestock in the Global South and being part of the CGIAR research network, has been described in the year 2020 (McIntire et al., 2020). ILRI scientific achievements can be categorized into three parts, namely animal genetics, production, and health; primary production; and livestock systems that include policy and economics, climate change research, and gender, with numerous scientific and development outcomes. Another example of research-led success is Brazilian Embrapa, a government-owned and independently led research company to develop agriculture across the many biomes of Brazil. It was established in 1973 with the task to provide Brazil with food security and a leading position in the international market for food, fiber, and energy. To meet such a continuous challenge, in permanent dialogue with farmers, scientific organizations, and both government and civic leaders, Embrapa has been guided by the following tenets: 1) scientific excellence in agricultural research, 2) crops and livestock production efficiency and quality, 3) environmental sustainability, 4) social aspects, and 5) partnerships with the production sector (Embrapa, 2022). In 2022, Embrapa employed around 2000 researchers (221 in cattle-related) in 43 research centers working on 1036 ongoing projects. Embrapa’s research is widely credited to have created the foundation for Brazil’s agricultural success. The company calculates that for every Brazilian Real invested in Embrapa research, the society receives 23.38 Reais of economic return (1 BRL = 0.19 USD in 2022). These experiences were also echoed by the Science Group at the UN Food System Summit, where Braun et al. highlighted that the three most immediate steps should be to increase scientific research funding, scientific research capacity, and a strengthened mechanism for science/policy interface (Braun et al., 2021). Research and development will bear fruit if the societal conditions are strategically aligned towards promoting livestock production systems. An instrument that has proven to be particularly purposeful are so-called Livestock Master Plans (LMPs). In recognition of the under-investment in livestock, livestock master plans are mechanisms for governments to identify, verbalize, and prioritize livestock interventions. Through rigorous data collection, modeling, and stakeholders’ engagement, an LMP document provides essential evidence for enhanced and targeted investments towards sustainable livestock, both from private and public sector actors. Upfront, an LMP process recognizes the diversity of livestock species and production systems and establishes priorities which of them are particularly suited to the context of the country. Starting with the analysis of the current situation, stakeholders agree on long-term objectives to set long-term strategies and action plans. Roadmaps with specific visions, targets, challenges, strategies, and proposed investments in technology and policy interventions, with expected outputs, outcomes, and impacts are mapped out. Moreover, the process supports the capacity building of key stakeholders, for continuous update of the model based on new data and change in scenarios. The methodology has been successfully applied in Ethiopia, Rwanda, Uzbekistan, Tanzania, Bihar (India), The Republic of Gambia, and Odisha (India), with more LMPs in preparation (ILRI, 2022). Selected Examples of How Livestock Improves Socioeconomic Performance of Households in Lower- and middle-income Countries. Source: ILRI Zambia: livestock transfers increased asset accumulation by 125% and increased household incomes by 59% over 42 months Rwanda: one cow per poor family initiative led to 14% more assets and 8% more types of assets Across 6 low-income countries: livestock introduction led to 9% more assets, 14% more savings and 5% more income Niger: 60% of households rely on sales of animals to cope with food shortages or unexpexted medical expenditures Kenya: pastoralist households covered by an index-based livestock insurance were 36% less likely to be forced into distress sales of stock, 25% less likely to have to reduce the size of their meals, 33% less dependent on food aid Ethiopia: doubled incomes with cattle fattening programs Nepal: doubled incomes with goat value chain improvements Bangladesh: poultry interventions increased household incomes by 49% Kenya: a rural chicken vaccination program against Newcastle led to children having 24% more protein-rich food, which led to 1.16% more height, and 0.54% more weight Prospects and Promise of Smallholder Livestock Farming Systems Nearly 50% of the world’s livestock and cereals are grown on farms of less than 20 ha. In emerging and developing economies, this number is 70% (World Economic Forum, 2019). Of those farms where livestock is a component in the farming mix (which could be at least half a billion globally), the socioeconomic livelihoods are much improved among many dimensions: in terms of absolute levels of income, in terms of income stability, and in terms of cash-surplus generation to participate in the formal economy (Staal et al., 2020). All of this contributes overproportionally to the levels of food security and educational attainment of all members of the farming household and provides important resilience against environmental and socioeconomic volatility. In most communities, it is the women who are the owners of the animals, thus serving as a gateway to gender equality. The manifold ways in which livestock are deeply interwoven with the socioeconomic, nutritional, cultural, and health contexts of households in low- and middle-income countries are often overlooked. This is also because they may be ambivalent and hard to measure, and thus are removed from the view of the bigger picture. However, the reality is that livestock are just as intimately connected, at times essential with people’s livelihoods, cultures, and societies as they are with the better-studied health, food, nutrition, environment, and economic sectors. Due to these myriad connections, it is particularly important that potential trade-offs as well as synergies in developing sustainable livestock systems for lower-income societies are analyzed and addressed, both to jump on emerging opportunities and to avoid unintended consequences. Numerous case studies in almost any socio-cultural context prove that significant improvements of productivity of livestock farming are both possible and desirable within the smallholder context (see textbox for some examples). But it can only be successful if the whole contextual dimensions are considered and are well integrated into business models and value chains. Conclusion and Outlook While the aggregated picture of the size of the economic challenge for sufficient animal-sourced food production may look daunting, the granular conditions on the ground give rise to optimism. Many years of research and improvement in the institutional and policy frameworks are paying off on the ground. Opportunities are created and utilized. The business case studies in the adjacent text box anecdotally illustrate that higher investments in higher productivity livestock systems do not automatically come at the expense of environmental degradation, and moreover, are well capable of supplying bottom of the pyramid customers in low-income countries with cost effective and affordable sources of protein and nutrients. The implementation of a host of technologies increases livestock performance faster than at any time in history. Advances in breeding selection, in feed composition, in digitalization enabled precision livestock farming, and in financial instruments available to the farmer are opening large and lucrative spaces for private investment on any scale, from the smallholder to the venture investor. There are many paths forward which promise success, especially when livestock farming is made to be part of the solution. Case Studies Illustrating the Potential for Livestock Around the World to Nourish People and Protect the Environment Poultry: Ethiochicken is a privately-owned company in Ethiopia which combines a robust dual-purpose poultry breed developed by best-in-class animal genetics technologies, with advanced feed-, vaccination-, and farm management methods. Within only 5 years from 2015 to 2020, the company has tripled the per person egg supply throughout Ethiopia, especially in rural communities. Ethiochicken birds are four to five times more productive than traditional village chicken, and thus make much more efficient use of rural community resources of feed, water, and infrastructure. The company enabled the formation of 8000+ small enterprises and strengthened the socioeconomic livelihood of at least 4 million rural small-scale farmers in the country. Most beneficiaries of these improvements are the livelihoods of women and children as they are the usual livestock keepers in these households. Higher resource efficiency, poverty alleviation, and better nutrition leading to healthier people all combine to reduce the pressure on environmental resources in the rural communities. Ethiochicken kept on generating high business growth also in 2021 and 2022, despite the pandemic and the military conflict in the Northern part of the country. Dairy: The Embrapa experimental dairy farm in Sao Carlos, Brazil seeks to demonstrate economic and social sustainability. The dairy cows are grazing in two separate areas: during the day in a field with row-planted trees which provide shade and grow biomass, and during the night in an open field with only tropical grass. The cows arrive by themselves twice a day to an automated milking parlor, where a robot performs all milking activity without human intervention. Upon exit the cows will be directed by fencing to another area. The overall system is designed to be climate neutral with carbon sequestration in the soils and in the tree biomass, to maximize animal welfare as the animals roam and graze freely, and to be socially sustainable as only a minimum amount of human labor is required to run the 
operation. Cattle: Shangani in Zimbabwe is a 65,000-ha ranch with no internal fencing situated in natural savannah shrub land, receiving annual rainfall of about 600 mm. Its carrying capacity for commercial cattle is around 16,000 head. The herd is managed in groups of around 200 animals each, which are rotationally grazed on an unmarked paddock system. The animals are in a protected kraal during the night. Amidst the commercial cattle, the ranch also supports a wild group of 300 male elephants who roam the ranch during winter, and about 600 wild giraffes (changes seasonally). There are also several thousand heads of different antelope species, including elands, kudus, nyalas, impalas, and more. A wild zebra population of more than 1,000 head also populates the ranch. The wildlife is not hunted. It is kept in balance by may be 150 wild leopards on the ranch. All typical bushland bird species are prevalent. While the commercial cattle graze the grasses, the wildlife keeps the growth of bush under control, and in this way coexist in ecological synergy. The elephants are kept away from gardens and residential houses on the ranch through trenches that are half a meter wide and one meter deep. As there is no hunting or harassing, wildlife and humans cohabitate safely without aggression but at respectful distance. Measurements have shown that the carbon sequestration of the rotational grazing fully compensates the methane emissions of the cattle. Pigs: Hamletz is a private breed brand developed by Ms Annechien ten Have. On her farm operations with 600 sows and 5,000 finishers in northern Netherlands she breeds her own type of pigs. The local brand allows her to generate higher prices for her output. The pigs operate as part of a largely circular system, where almost all feed of wheat, sugar beets, and corn are grown on the farm or nearby, and where the animal manure is either recycled on the fields or burned in its 1,1 MW biogas plant. Ms ten Have is the first pig producer in the Netherlands to produce to the standards of the “Better Life Two Stars” requirements, providing the pigs with respective space and living circumstances. Tilapia aquaculture: Victory Farms built up a 10,000-ton annual production capacity of tilapia fish farming in Lake Victoria in Kenya since 2015. By deploying best-in-class aquacultural technology, and in conjunction with a proprietary retail system of reaching the final consumer, the company produces the most affordable animal-protein food for Kenya’s bottom of the pyramid consumers. Due to its economy of scale, the aquacultural operation can perform to the highest environmental standards in Lake Victoria, and at the same time relieve pressure from overfishing of the lake’s wild fish population. Victory Farms cooperates with not-for-profit Conservation International to foster and report improvements in biodiversity that evolved in their area since operations began. Global tilapia production has doubled over the last ten years, due to the high performance of this fish species to convert low value grains into high value animal proteins. Sheep: CAFRE hill farm is a 960 ha farm on marginal agricultural land in Ireland. The hill site is exposed to harsh weather influences and includes stretches of bogland. The farm operation makes best use of this land with a breeding ewe flock of 1,100 animals, split roughly in half with Scottish Blackface and crossbred animals composed of Blackface, Swaledale, and Texel. While the farm itself uses minimal amounts of inputs, relying mostly only on the grass habitat of the hills, it uses intensive data science to monitor individual animal performance. All animals are electronically tagged, and their data are tracked in a database for analysis. With the data, the farm optimizes its genetics, the health performance of the animals, and the stocking/paddock systems. CAFRE aims to wean 0.7 kg of lamb for every 1 kg of ewe liveweight, which is the major economic driver of commercial success.
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                Author and article information

                Contributors
                Journal
                Anim Front
                Anim Front
                anfron
                Animal Frontiers: The Review Magazine of Animal Agriculture
                Oxford University Press (US )
                2160-6056
                2160-6064
                April 2023
                15 April 2023
                15 April 2023
                : 13
                : 2
                : 3-8
                Affiliations
                GOALSciences at Global Food and Agriculture Network , Rapperswil, Switzerland
                Industrial Microbiology and Food Biotechnology (IMDO), Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel , Brussels, Belgium
                Author notes
                Article
                vfac098
                10.1093/af/vfac098
                10105845
                1843f7c1-a54f-4d34-8f70-77357d5f2749
                © Ederer, Leroy

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Page count
                Pages: 6
                Categories
                Introduction
                AcademicSubjects/SCI00960

                animal source foods,meat science,nutrition,sustainable livestock,economics of protein,ethics of livestock

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