Is it true that bioplastics are a sustainable alternative to plastics since they degrade quickly in nature?

This claim is certainly false. Some of these so-called “bioplastics” are biobased (made from renewable resources) but not actually biodegradable. Other materials known as “bioplastics” are biodegradable but require very specific conditions to disappear quickly – conditions that are not often found in nature. If biodegradable plastics end up in the wrong place, then they won’t biodegrade quickly or completely.