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7 major threats to our planet's oceans

Marine life is beginning to feel the effects of CO2 as the level of acidity on the ocean surface rises

Photo: ippei + janine/Flickr

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Ocean acidification

Greenhouse gases affect more than our way of life. The ocean takes in half of all CO2 emitted by humans, and marine life is beginning to feel its effects the level of acidity on the ocean surface rises, reducing the amount of calcium carbonate available to coral, plankton and other marine life.