Mutant 59: The Plastic Eaters, a 1971 British sci-fi environmental disaster novel written by medical scientist Kit Pedler and television screenwriter Gerry Davis.
replyNo wikipedia page, but goodreads has it here:
That wasn’t it; I just found it, it’s called Ill Wind by Kevin J Anderson
replyNot plastic, but 'Cats Cradle' by Kurt Vonnegut has something kind of like that.
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