Oceans absorb one third to more than half the carbon dioxide that humans put into the atmosphere.  Oceans hold 50 times more carbon dioxide than the atmosphere. At the surface of the ocean carbon dioxide and heat are exchanged with the atmosphere. Then the phytoplankton consume this carbon dioxide.  Their waste drops to the bottom of the ocean and settles the carbon there. Refer : http://m.csmonitor.com/Science/2014/0312/How-do-oceans-absorb-carbon-dioxide-Scientists-find-clues

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