But why put them in the hole? If you have no clean burning, the filter mostly gets carbon, which can be burned again. Some plastics like PVC release HCl, so you need to scrub that, but the result is harmless table salt. The biggest issue is formation of dioxins, so you need to have a high flame temperature to make sure everything burns clean. Otherwise dust etc. could contain heavy metals, but that is not directly from the plastic.

[–] MonkderVierte@lemmy.ml 1 points 1 day ago* (last edited 1 day ago)

I mean, climate change is coal (C) we take out of reserves in the form of oil and gas (from times where climate was warmer) and then burn it with oxygen (O) to CO².
Yes, plastic is a problem with pollution. But no matter how much we recycle it or if it rots away over centuries, hurting animals and poisoning environments: the end result is still that it is processed oil (C) out of a hole, contributing to greenhouse effect.