The gradual expansion of Northern Hemisphere glaciation about 3.6 million years ago followed a period of prolonged warmth. An analysis of ancient sea surface temperatures fuels the debate surrounding the roles of atmospheric carbon dioxide and global circulation in the cooling.
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Ravelo, A. Warmth and glaciation. Nature Geosci 3, 672–674 (2010). https://doi.org/10.1038/ngeo965
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DOI: https://doi.org/10.1038/ngeo965
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