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Here's a short video I made for Thames21 -We reconnect people to nature by helping them enjoy, protect and enhance their local rivers. The video shows a survey carried out by Thames21 volunteers to count the number of wet wipes found on the Thames foreshore at Hammersmith on one day in April 2017.

The survey's findings reveal that the Thames has the highest concentration of wet wipes ever recorded in Britain – with 277 found in just one square metre.
Over 4,500 wet wipes were found on one 154m sq patch of foreshore at the latest Thames River Watch citizen science event, the biannual Big Count: the highest number ever found in one place.
It’s likely that these figures are just the tip of the iceberg as the densities of wet wipes increased with distance from the shore.