Increased C02 in the ocean is severly affecting coral reefs ability to survive climate change alone.  A new study by scientists from Australia yielded results pointing the blame to human carbon dioxide emissions as being the cause of major coral bleaching. 

The study, by a team led by Dr Ken Anthony of the ARC Centre of Excellence for Coral Reef Studies and the University of Queensland, published in this week's Proceedings of the (US) National Academy of Sciences (PNAS) concludes that earlier research may significantly understate the likely damage to the world's reefs caused by man-made change to the Earth's atmosphere...