Equilibrium Doubled-CO2 Sensitivity by Observational Methods

By Christopher Monckton of Brenchley | Dec. 22, 2022 Dr Roy Spencer, in his formidable recent paper, has made perhaps the most comprehensive effort ever to evaluate all the available meteorological data and to derive therefrom an upper-bound estimate of <2.1 K equilibrium doubled-CO2 sensitivity (ECS). His method, like all the best methods, is based more on observational than on numerical techniques. He concludes that 2.1 K is an upper bound because climatology has not taken sufficient account of subsurface warming from below (Professor Viterito has long suspected subocean volcanism as a significant contributor to recent warming), and has also …