claim: a paper...in Science magazine concludes that the climate sensitivity—how much the earth’s average temperature will rise as a result of a doubling of the atmospheric concentration of carbon dioxide—likely ( that is, with a 66% probability ) lies in the range 1.7°C to 2.6°C, with a median value of 2.3°C.
evidence: IPCC authors concluded ECS is very likely to be greater than 1.5 °C ( 2.7 °F ) and likely to lie in the range 2 to 4.5 °C ( 4 to 8.1 °F ), with a most likely value of about 3 °C ( 5 °F ).