Acidification of the oceans is a major threat to marine life and humanity's food supply, Hilary Benn is to warn as the UN climate summit resumes.
The UK environment secretary will say that acidification provides a "powerful incentive" to cut carbon emissions.
Ocean chemistry is changing because water absorbs extra CO2 from the air.
Some believe this could be as big an impact of rising CO2 levels as climatic change, though it is rarely discussed within the UN climate convention.
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