(C6 H10 O5)-n....(C2 H4)-n....(CH2-HC-CH3)-n

Symbology above represents the molecular structure of three of the most abundant organic polymers in the world. We are hearing more and more about micro plastics taking over the world as a health hazard that is being found every where, every where, even in gonads.
The sky is falling folks only consider the second two polymers as the problem. The reason is the first is naturally occurring and therefore cannot be a problem by definition.

First polymer is cellulose, wood fibre, cotton fibre, grass etc

Second polymer is polyethylene, plastic bags, meat packing film

Third polymer is polypropylene, used for brooms and more rigid applications


When you read about microplastics in the ocean, be aware that cellulose is excluded, not because it is safe but rather its natural.

and my representation of the CH3 in polypropylene is a bit wonky. It is supposed to be a branch.