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Waterways charity Thames21 have been keeping tabs on the Thames for 20 years. They’re on a mission to stop the rising tide of plastic drinks bottles that end up in London’s famous river. Head along to one of 20 sites along the Thames foreshore to help them count and remove the scourge of plastic. Last year 2,500 bottles were retrieved, and this year they're hoping to go even further. Find your nearest collection point here. In association with Totally Thames.