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Nature 433, 809-810 (24 February 2005) | doi:10.1038/433809a; Published online 23 February 2005

Climate change:  Snow maker for the ice ages

Katharina Billups1

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In the Northern Hemisphere, large-scale glaciation was initiated comparatively recently. Paradoxically, it seems that the trigger was a seasonal warming of the sea surface in an upwind oceanic region.

Over the past 50 million years, the Earth's climate has been cooling (Fig. 1).

  1. Katharina Billups is at the College of Marine Studies, University of Delaware, 700 Pilottown Road, Lewes, Delaware 19958, USA.
    e-mail: Email: kbillups@udel.edu

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