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Between three and 11 million tons of plastic waste have gathered at the bottom of the world's oceans, according to a study published this month by Australian and Canadian researchers. Using remotely operated underwater vehicles (ROVs), it was possible to quantify approximately how much plastic waste ends up on the seabed and where it accumulates before it is broken down into smaller pieces and mixed with the marine sediment, said Denise Hardesty of the Australian science agency Csiro. "We know t

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