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There's heightened concern about the future state of the world's oceans. New research indicates that if seawater continues to acidify at the rate currently seen then the marine environment could lose about 30% of the diverse life forms that exist within it by the end of the century. The research was presented at a major meeting in Vancouver.

Much of the carbon dioxide put into the atmosphere through fossil fuel burning is being absorbed by the seas. It's acidifying the waters, corroding the shells and skeletons of corals, sea urchins and similar species. Scientists want to know how conditions might deteriorate in the future and have been looking at underwater volcanoes, where C02 naturally bubbles through the water.