claim: [ ocean acidification was  ] First referenced in a peer-reviewed study in Nature in 2003
evidence: In a synthesis report published in Science in 2015, 22 leading marine scientists stated that CO 2 from burning fossil fuels is changing the oceans' chemistry more rapidly than at any time since the Great Dying, Earth's most severe known extinction event, emphasizing that the 2 °C maximum temperature increase agreed upon by governments reflects too small a cut in emissions to prevent dramatic impacts on the world's oceans, with lead author Jean-Pierre Gattuso remarking that The ocean has been minimally considered at previous climate negotiations.