Politico: UN plastic talks on verge of collapse in final hours

[Igel]

2. But some single-use plastic is being found to be not so single-use.

https://www.whoi.edu/press-room/news-release/sunlight-degrades-polystyrene-faster-than-expected/

I'm curious as to what happens if they don't remove the fraction that doesn't degrade and include that in the input stream as they reprocess the monomers that result from sunlight-based polymer degradation.

Or if they simply purify out the undegraded fraction and put them through with a fresh batch of "virgin" polystyrene?

Note that if they really do start with the monomers, the resulting recycled polystyrene should be indistinguishable from polystyrene made using feedstock freshly produced from petroleum.