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Science 10 February 2006:
Vol. 311. no. 5762, p. 737
DOI: 10.1126/science.311.5762.737f
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This Week in Science
A number of unusually warm or cold intervals can be seen in most proxy records of temperature of the last millennium, so how can we assess the relative magnitude of the current warm period? Osborn and Briffa (p. 841) compared the geographic extent of late 20th-century warming in the Northern Hemisphere to the distribution of both warm and cold intervals for the last 1200 years by adopting specific thresholds to define warm and cold periods in order to avoid questions about of the absolute magnitude of warm and cold events, and they considered only a subset of the data chosen specifically for its value as a temperature proxy. They find that the continuing warmth of the late 20th century is the most widespread and longest temperature anomaly of any kind since the 9th century A.D.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
