Fifth of world's corals already dead, say experts

Almost a fifth of the planet's coral reefs have died and carbon emissions are largely to blame, according to an NGO study released Wednesday.

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<p><a href="http://www.physorg.com/news148116950.html">Fifth of world's corals already dead, say experts</a></p> <p>Almost a fifth of the planet's coral reefs have died and carbon emissions are largely to blame, according to an NGO study released Wednesday. </p>