arising from P. M. Cox, C. Huntingford & M. S. Williamson Nature 553, 319–322 (2018); https://doi.org/10.1038/nature25450

The Intergovernmental Panel on Climate Change1 (IPCC) has estimated the likely range of equilibrium climate sensitivity (ECS) to be 1.5–4.5 K. Recently, Cox et al.2 claimed to have reduced this uncertainty to a likely range of 2.2–3.4 K. However, we believe that their results are derived from incorrect physics and are sensitive to arbitrary methodological choices. The study therefore does not represent a credible constraint on either the IPCC likely range or the range observed in the selected set of climate models. There is a Reply to this Comment by Cox, P. M. et al. Nature 563, https://doi.org/10.1038/s41586-018-0641-x (2018).

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