I'm not sure but as I understand it, micro particles get into everything and everyone. At least you can see a carrier bag and not swallow it or dump it in the sea. Have I got it wrong?
It depends on nano-particles of what. Standard polymers, yes. You can get modern bio-plastics made entirely of potato starch - which should resolve back down to potato. The key is to try and find out what your stuff is made from - often it's very difficult to get details. If the packaging just says 'biodegradable' or 'compostable' this is pretty useless. Just because something takes ages to fully biodegrade, doesn't mean it won't fully go back to become earth at some point in the near-ish future.
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It depends on nano-particles of what. Standard polymers, yes. You can get modern bio-plastics made entirely of potato starch - which should resolve back down to potato. The key is to try and find out what your stuff is made from - often it's very difficult to get details. If the packaging just says 'biodegradable' or 'compostable' this is pretty useless. Just because something takes ages to fully biodegrade, doesn't mean it won't fully go back to become earth at some point in the near-ish future.