It essentially takes the plastic back to its molecular origins, back to its raw materials." According to Ontario's Ministry of the Environment, advanced recycling plants do not burn plastic.

Plastic waste generation and emissions from the domestic open burning of plastic waste in Guatemala. Environmental Science: Atmospheres, 3 (1), 156-167. doi: 10.1039/d2ea00082b ...

According to Ontario's Ministry of the Environment, advanced recycling plants do not burn plastic. "The process is usually done in a low-, or no-, oxygen state that doesn't support burning," Gary ...