A Paleoclimatic Enigma?

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Science  14 May 2010:
Vol. 328, Issue 5980, pp. 838-839
DOI: 10.1126/science.1188292

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Major glaciations began in the Northern Hemisphere around 2.75 million years ago, after a long prior interval of climatic cooling. Numerous observations reveal how climate cooled before glacial onset, but our understanding of the driving forces behind the cooling remains incomplete.