Exclusive: Annual consumption of plastic bottles is set to top half a trillion by 2021, far outstripping recycling efforts and jeopardising oceans, coastlines and other environments
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 A file picture dated 13 April 2010 shows a boy from Senegal walking along a polluted beach strewn with predominantly plastic bottles in the village of Ngor, Dakar, Senegal. Photograph: Nic Bothma/EPA