The good news comes from Joe Kelly, who investigated the large “ultrafast” response ofEarth’s energy imbalance (EEI) to a 2×CO2 forcing in the GISS (2020) GCM. Specifically,we reported in Pipeline that the initial 4 W/m2 imbalance dropped by about 30% (to 2.7W/m2) in year 1 after the forcing was imposed.