Ruddiman first began studying records of climate change in ocean sediments as a graduate student at Columbia University, where he received his doctorate in 1969.
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- 鲁迪曼最初开始研究海洋沉积物中的气候变迁记录,是在哥伦比亚大学念研究所的时候,不久即于1969年获博士学位。