The Truth About Biodegradable Plastics

In an effort to stymie plastic pollution, several companies have engineered so-called compostable “bioplastics.” But are biodegradable plastics really what they claim?

biodegradable plastics - composting test
Of the purportedly biodegradable plastics we tested, only Novamont's Mater-Bi (top left), was compostable in typical home compost pile conditions.
PHOTO: GRETCHEN STUART