"Oceans are taking in about 90 percent of the excess heat created by human greenhouse gas emissions, but they’re also absorbing some of the carbon dioxide (CO2) itself. According to the European Space Agency, about a quarter of all human CO2 emissions are being taken in by the world’s oceans.
A complex set of chemical processes dissolves that CO2 and turns it into carbonic acid, which dissolves shells and coral, creating a cascade effect that could disrupt entire marine ecosystems. The current rate at which oceans are acidifying has been unseen in 300 million years and the consequences could be costly..."
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