Thermal depolymerization of plastic closes the loop provided you can pay the energy cost renewably though - just break it all the way down to monomer units, at

Thermal depolymerization of plastic closes the loop provided you can pay the energy cost renewably though - just break it all the way down to monomer units, at which point you can distill and repolymerize as though it's a virgin material. You also can't really meaningfully recycle glass, for pretty much the same reasons.