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Science 27 March 2009:
Vol. 323. no. 5922, p. 1655
DOI: 10.1126/science.323.5922.1655
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News of the Week

GLOBAL WARMING:
Arctic Summer Sea Ice Could Vanish Soon But Not Suddenly

Richard A. Kerr

After paring 23 climate models down to the best half-dozen, two researchers now say with new confidence that arctic summer ice will most likely disappear around 2037. But none of the select models predicts a tipping point--a sudden jump to an ice-free summer Arctic.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)