Scientists warn that the acidification of the oceans poses a serious threat to the world's food supply as well as a "powerful incentive" to reduce carbon emissions. Though it was not a subject for discussion at the UN climate talks at Copenhagen, the increased carbon-dioxide levels in the world's seas might be as significant a development as atmospheric climate change itself. The increased acidification of the oceans could affect all levels of marine life, from coral to fish, as well as the billion people worldwide who depend on the sea for food.

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