these days new types of plastic which are said to be biodegradable are available what are they called and whether they do or do not harm the envionment?

Plastic which is capable of being decomposed by bacteria or other living organisms is called biodegradable plastic. There are two types of biodegradable plastics:

Bio plastics which are derived from renewable raw material

Plastics derived from petrochemicals with additives that enhance degradation.

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