I thought Biorefineries already existed. Dow has plants in Kansas where they've developed bacterial that eat sugar and excrete plastic as their waste. The cost per unit for production levels was rapidly falling, and this was 3 or 4 years ago. They were feeding sucrose extracted from locally grown corn into big vats with the engineering bacteria (who have an exceptionally high.. iirc 60%+). The plastic "waste" is formed into little balls and shipped off for use in textiles, composite lumber, etc, etc.
oh lol, nm. I should actually read the articles... didn't realised the crap was going in, not getting taken out.