They were caused by changes to the ocean's chemistry brought about by absorption of two primary greenhouse gases, carbon dioxide and methane, through a process of acidification of ocean water. (scientificamerican.com)
Whether they could survive both a sustained rise in temperatures and the increasing acidification of the oceans that goes with higher carbon dioxide levels is another matter. (climatenewsnetwork.net)
And, by the way, want to talk about any of the «non» Global Warming implications such as acidification of the oceans? (getenergysmartnow.com)