Making plastic requires a specific step of heating to very high, specific temperatures and pressures and separating components of petrochemicals or similar biom

Making plastic requires a specific step of heating to very high, specific temperatures and pressures and separating components of petrochemicals or similar biomass that cannot be easily reversed by aging or biological processes. A metaphor for this might be thinking about cracking an egg and scrambling it in a frying pan, then attempting to reverse this and put the egg back together only using mechanical steps and cooling - it's impossible by any practical means.