claim: In fact, the authors go on to estimate climate sensitivity from their findings, calculate a value between 2.3 to 4.1°C.
evidence: The 1990 IPCC First Assessment Report estimated that equilibrium climate sensitivity to a doubling of CO 2 lay between 1.5 and 4.5 °C ( 2.7 and 8.1 °F ), with a best guess in the light of current knowledge of 2.5 °C ( 4.5 °F ).