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Leaving more big fish in the sea--especially where fishing is not economically profitable in the Central Pacific, South Atlantic, and North Indian Oceans --reduces the amount of carbon dioxide (CO2) released into the Earth's atmosphere. Credit: Enric Sala.
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An international team of scientists has found leaving more big fish in the sea reduces the amount of carbon dioxide (CO2) released into the Earth's atmosphere. When a fish dies in the ocean it sinks to the depths, sequestrating all the carbon it contains with it. This is a form of 'blue carbon'—carbon captured and stored by the world's ocean and coastal ecosystems. 

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