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Climate change is having a profound impact on the world's oceans, which are absorbing around a quarter of the carbon we are emitting into the air. Our environment correspondent Matt McGrath sought the help of ocean acidification expert Professor Jason Hall-Spencer of Plymouth University to see what happens in areas there is higher acidity in the water. Professor Hall-Spencer dives near undersea volcanoes to see what happens in areas where the acidity is higher, and he designed an experiment for Matt to explain what's happening in the seas.

(Photo: Matt McGrath and Professor Jason Hall-Spencer)