Page last updated at 20:49 GMT, Tuesday, 10 March 2009

Nature's own acidic ocean

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Carbon dioxide emissions from human activities are acidifying the oceans and threaten a mass extinction of sea life, a top ocean scientist has warned.

The volcanic island of Ischia, off the Italian coast, has natural CO2 vents meaning the sea in this area has been naturally more acidic.

This should give scientists a very good idea of how species will adapt to acidity or not, as Roger Harrabin has been finding out.

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