Well, plastic came from the underground (as oil) and to the underground should return, as much as possible. You could argue that when plastic waste is not burne

Well, plastic came from the underground (as oil) and to the underground should return, as much as possible. You could argue that when plastic waste is not burned, a corresponding amount of fossil fuels are extracted from the underground to make up the difference, but I think the existence of renewable energy sources makes the replacement ratio (waste plastic to new fossil fuels) much less than 1 to 1.