claim: Study finds low probability of both very low and very high climate sensitivities, and its lower estimate ( as compared to the IPCC ) is based on a new temperature reconstruction of the Last Glacial Maximum that may or may not withstand the test of time.
evidence: For constant humidity they computed a climate sensitivity of 2.3 °C per doubling of CO2 ( which they rounded to 2, the value most often quoted from their work, in the abstract of the paper ).