Cycles, Cycles Everywhere

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Science  22 Feb 2002:
Vol. 295, Issue 5559, pp. 1473-1474
DOI: 10.1126/science.1069617

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A recent symposium celebrated the publication, 25 years ago, of the first reliable paleoclimatic evidence for Milankovitch's theory that regular changes in Earth's orbit around the Sun drive climate cycles on Earth. As Crowley discusses in his Perspective, Milankovitch cycles are now widely recognized in paleoclimatology and beyond, but the mechanisms of this forcing remain incompletely understood.