PLA (polylactic acid) and its limits
The most common compostable bioplastic, made from fermented corn or cane sugar; suits clear cups and clamshells but only breaks down in industrial composting.
Food packaging and film
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PHA (polyhydroxyalkanoates)
Bacteria-made polyesters that biodegrade in soil, fresh water and seawater; the only mainstream bioplastic family that does not depend on industrial composting.