only a limited extent. Furthermore, under anaerobic incubation,
some of the bio-based plastics biodegraded to generate methane, a
potent greenhouse gas that unless captured may negate the
perceived environmental benefits of using these materials. Biodegradable
plastics made from petroleum (Class II), may have more
adverse environmental impacts than conventional plastics (Class I)
if their ultimate fate is landfilling and anaerobic conversion to
methane.