Marathons and other high-profile running events often leave behind vast trails of trash, with plastic water bottles scattered in the streets and mounds of clothing left behind at the starting line. It can be an ugly sight.
Read MoreUnfortunately, of the 6.3 billion tonnes of plastic waste produced since the 1950s only 9% has been recycled and another 12% incinerated. The rest has been dumped in our environment and could fill an area 70 metres deep and 57 square kilometres in size, which equals the size of Manhattan.
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