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Brief Communication Arising

Nature 446, E2 (1 March 2007) | doi:10.1038/nature05708; Published online 28 February 2007

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Climate modelling: Uncertainty in climate-sensitivity estimates (Reply)

Gabriele C. Hegerl1, Thomas J. Crowley2, William T. Hyde2 & David J. Frame3

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Despite Schneider's claim1, the method we use to estimate equilibrium climate sensitivity from multiple proxy-based reconstructions of the temperature in the Northern Hemisphere2 does account for uncertainty in reconstructions, including that associated with non-temperature and sampling error in the reconstruction. We arrive at a tighter constraint on climate sensitivity not by neglecting uncertainties, but by combining our wide-tailed proxy-based estimate with an independent estimate of climate sensitivity based on twentieth-century warming.