PerspectiveClimate Change

Ice Age Rhythms

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Science  12 Feb 2010:
Vol. 327, Issue 5967, pp. 790-791
DOI: 10.1126/science.1186256

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What caused the series of more than 20 ice ages that have come and gone during the past 2 million years of Earth history? On page 860 of this issue, Dorale et al. (1) reveal a new twist in the most recent ice age cycle and demonstrate once again the rapidity with which large ice sheets can come and go.