Palaeoclimate: Climate sensitivity in a warmer world.

The article discusses a research paper on climate-sensitivity determinations from the warm Pliocene epoch compared to those from the cold Pleistocene epoch. It references a study by M. A. Martínez-Bóti et al., published within the issue of "Nature". It discusses the method used by the researchers and the use of the instrumental temperature record to narrow the equilibrium climate sensitivity range.