Blowing Hot and Cold

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Science  22 Mar 2002:
Vol. 295, Issue 5563, pp. 2227-2228
DOI: 10.1126/science.1069486

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Tree-ring records play an important role in reconstructing climate change patterns over the last millenium. In their Perspective, Briffa and Osborn highlight the report by Esper et al. of a largely independent record of widespread tree-growth variations across the extra-tropical Northern Hemisphere. Estimates of past temperature changes based on the record suggest that climate swings in the last 1000 years were greater than has yet been generally accepted.