> How many types of plastic are there, half a dozen? Several dozen major ones, starting at cellulose. And before you think I'm missing the point: Well, no, ce

> How many types of plastic are there, half a dozen? Several dozen major ones, starting at cellulose. And before you think I'm missing the point: Well, no, cellulose didn't biodegrade for what IIRC several hundred million years. That's why there's no such coal. It still barely biodegrades.