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      Bioplastic production in terms of life cycle assessment: A state-of-the-art review

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          Production, use, and fate of all plastics ever made

          We present the first ever global account of the production, use, and end-of-life fate of all plastics ever made by humankind.
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            A bacterium that degrades and assimilates poly(ethylene terephthalate).

            Poly(ethylene terephthalate) (PET) is used extensively worldwide in plastic products, and its accumulation in the environment has become a global concern. Because the ability to enzymatically degrade PET has been thought to be limited to a few fungal species, biodegradation is not yet a viable remediation or recycling strategy. By screening natural microbial communities exposed to PET in the environment, we isolated a novel bacterium, Ideonella sakaiensis 201-F6, that is able to use PET as its major energy and carbon source. When grown on PET, this strain produces two enzymes capable of hydrolyzing PET and the reaction intermediate, mono(2-hydroxyethyl) terephthalic acid. Both enzymes are required to enzymatically convert PET efficiently into its two environmentally benign monomers, terephthalic acid and ethylene glycol.
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              The role of hydrogen and fuel cells in the global energy system

              Hydrogen has been ‘just around the corner’ for decades, but now offers serious alternatives for decarbonising global heat, power and transport. Hydrogen technologies have experienced cycles of excessive expectations followed by disillusion. Nonetheless, a growing body of evidence suggests these technologies form an attractive option for the deep decarbonisation of global energy systems, and that recent improvements in their cost and performance point towards economic viability as well. This paper is a comprehensive review of the potential role that hydrogen could play in the provision of electricity, heat, industry, transport and energy storage in a low-carbon energy system, and an assessment of the status of hydrogen in being able to fulfil that potential. The picture that emerges is one of qualified promise: hydrogen is well established in certain niches such as forklift trucks, while mainstream applications are now forthcoming. Hydrogen vehicles are available commercially in several countries, and 225 000 fuel cell home heating systems have been sold. This represents a step change from the situation of only five years ago. This review shows that challenges around cost and performance remain, and considerable improvements are still required for hydrogen to become truly competitive. But such competitiveness in the medium-term future no longer seems an unrealistic prospect, which fully justifies the growing interest and policy support for these technologies around the world.
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                Author and article information

                Journal
                Environmental Science and Ecotechnology
                Environmental Science and Ecotechnology
                Elsevier BV
                26664984
                July 2023
                July 2023
                : 15
                : 100254
                Article
                10.1016/j.ese.2023.100254
                37020495
                e17c8367-52b2-4549-905f-48248a4e28a3
                © 2023

                https://www.elsevier.com/tdm/userlicense/1.0/

                http://creativecommons.org/licenses/by/4.0/

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