There's a fun trashy sci-fi novel I read years ago about how potentially devastating it would be if a plastic-eating microbe got loose: https://www.goodreads.com/book/show/2368220.Mutant_59

It reads like a summer disaster movie, entertaining but mostly forgettable. What was interesting about the book was as a thought experiment about the use of plastics in critical infrastructure and how much of a nightmare plastic-eating anything could be.