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Beam trawlers’ heavy chains are dragged along the seabed, releasing carbon into the seawater. Photograph: aphperspective/Alamy
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Fishing boats that trawl the ocean floor release as much carbon dioxide as the entire aviation industry, according to a groundbreaking study. Bottom trawling, a widespread practice in which heavy nets are dragged along the seabed, pumps out 1 gigaton of carbon every year, says the study written by 26 marine biologists, climate experts and economists and published in Nature on Wednesday. 

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