It seems to me that with humans making so much of these 'harmless' (or at least relatively-low-toxicity) plastics, we have essentially created a giant niche waiting there for the first micro (or even perhaps macro) organism(s) that can live off this stuff, they are srsly going to have a massive field day once their day roles around!

It could of course be fairly troubling when pieces of our various machines/buildings/etc start to decompose earlier than expected! This assumes quite some luck in terms of mutation to be fair, and maybe humans might also help with speeding that up too? could be good!?