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: When climate sensitivity is expressed for a doubling of CO2, its units are degrees Celsius ( °C ).