If plastic is just complex chains of carbon, why are there concerns of toxic chemicals being released when it touches food or is accidentally burned/consumed?
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Plastic is not just the polymer, there are lots of additives to give specific characteristics like flexibility, UV resistance, color, flame resistance, processing aids, biocides, etc. There are over 10,000 chemicals that are used in plastic manufacturing ([source](https://pubs.acs.org/doi/pdf/10.1021/acs.est.1c00976)).
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