Ellen Thomas, Yale University (IMAGE) Columbia Climate School Caption Ellen Thomas, a paleoceanographer at Yale University, examines a core of sediment from some 56 million years ago, when the oceans underwent acidification that could be an analog to ocean changes today. Credit Steve Schellenberg Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.