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Most modern-day plastics are made from petroleum, but several different types of plastics are made from plant or even bacterial sources. This 4-page fact sheet written by Maia Patterson McGuire and published by the UF/IFAS School of Forest Resources and Conservation describes four types of these bioplastics and explains why, even if a bioplastic item is listed as “compostable,” a reusable, washable alternative is often the better choice. http://edis.ifas.ufl.edu/fr418
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Maia McGuire (2019) studied this question.
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