Currently, the ocean takes up about one quarter of global CO2 emissions from human activities. The uptake of CO2 in the sea causes ocean acidification, as the pH of sea water declines.
Ocean surface pH declined from 8.2 to below 8.1 over the industrial era as a result of an increase in atmospheric CO2 concentrations. This decline corresponds to an increase in oceanic acidity of about 30 %.
European Environment Agency, 25 June 2021. Resource.
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