Corals facing 'biggest impact in history'

A new study has found that the damage caused by human activity to some of the world's iconic coral reefs in the past 30 years is greater than at any time in the last 220,000 years.

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<p><a href="http://www.physorg.com/news69947619.html">Corals facing 'biggest impact in history'</a></p> <p>A new study has found that the damage caused by human activity to some of the world's iconic coral reefs in the past 30 years is greater than at any time in the last 220,000 years.</p>