Probably a lot of them are byproducts, side reactions etc. Things which form chemically alongside the main "plastic-making" reactions. Kind of like how car exha

Probably a lot of them are byproducts, side reactions etc. Things which form chemically alongside the main "plastic-making" reactions. Kind of like how car exhaust contains all sorts of compounds (most of which are burnt up by the catalytic converter, fortunately) other than CO2 and H2O.