According to Wikipedia: "Biodegradable plastics are plastics that can be decomposed by the action of living organisms, usually microbes, into water, carbon dioxide, and biomass.
Greene, Joseph P. Sustainable Plastics: Environmental Assessments of Biobased, Biodegradable, and Recycled Plastics. Wiley. 2022. Section 15.2, p. 415. https://doi.org/10.1002/9781119882091.ch15 ) - - Traditional plastics can be made from agricultural products including corn, sugar beets, sugarcane, and wheat - all of these crops consume less energy to do so than traditional fossil fuels. Sugarcane and sugar beets require half the land to produce than corn.