claim: The Schmittner et al. 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: The IPCC Fifth Assessment Report reverted to the earlier range of 1.5 to 4.5 °C ( 2.7 to 8.1 °F ) ( high confidence ) because some estimates using industrial-age data came out low.