why can't we compost plastic bags
The plastic-coated paper products currently being collected by many composting programs produce both macro- and micro-fragments of non-biodegradable plastic which contaminate the finished compost. Once these plastics are dispersed into the environment, they have not been shown to biodegrade and are suspected of causing detrimental effects to organisms in a variety of ecosystems. We can expect these fragments to persist indefinitely and to be so widely dispersed that it will be impossible to clean them up. Compost collection programs and compost facilities must exclude plastic-coated paper products from their guidelines to prevent future harm.