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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.
The authors are in the Climatic Research Unit, University of East Anglia, Norwich NR4 7TJ, United Kingdom. E-mail: k.briffa{at}uea.ac.ukand t.osborn{at}uea.ac.uk
