But what these tonnes of microscopic4 fragments show is that decades of plastic pollution has been washed from rivers or even blown on the wind into the ocean.
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Related: tonne
Prev: From ancient oak forests to centuries-old groves1 of ash or beech2, they provide a refuge for wildlife, including butterflies, birds and insects, and lock up millions of tonnes of carbon.
Next: But that still left the price of a tonne of carbon dioxide comfortably above its lowest level last year.
