Back-of-the-envelope calculation: https://www.climate-lab-book.ac.uk/2015/back-of-the-envelope-attribution/ https://www.climate-lab-book.ac.uk/2015/back-of-the-

Back-of-the-envelope calculation: https://www.climate-lab-book.ac.uk/2015/back-of-the-envelope-attribution/ https://www.climate-lab-book.ac.uk/2015/back-of-the-envelope... The TCR needs some explanation, but can be estimated from the Stefan-Boltzmann law; the temperature differential to produce a radiative output of 3.7 W/sq m is 3.7 / (4 * sigma * T0^3) which at a T0 of 287 K is 0.69 K. Clearly the Earth is not a perfect black-body so this lower bounds the TCR. This also allows us to lower bound the anthrogenic climate contribution due to GHG radiative forcing 1850-2020 at 0.48 K.