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Nature 453, 154-155 (8 May 2008) | doi:10.1038/453154b; Published online 7 May 2008

Energy assumptions were reasonable at the time, but not now

Christopher B. Field1

  1. Carnegie Institution for Science, Stanford, California 94305, USA

Pielke et al. correctly point out in their Commentary 'Dangerous assumptions' (Nature 452, 531–532; 2008) that almost all of the Intergovernmental Panel on Climate Change (IPCC) emissions scenarios assume continuing improvements in the energy intensity of the global economy and in the carbon intensity of the global energy system, even in the absence of explicit climate policy. This assumption is not hidden, as Pielke et al.