I'm a long-retired marine biologist living on the South Wales (UK) coast.
Even 20 years ago, plankton samples taken off this south-westerly shore
contained more fragments of plastic than plants or animals and, searching
shore windrows for micro-gastropod shells, I again found a high proportion
of such fragments. It can only have got worse since then! However, it's
wrong to say that plastics never degrade. I understand that a typical item
will largely have disappeared within 350 to 400 years (!).
Tony N-S.
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