Marine low clouds strongly cool the planet. How this cooling effect will respond to climate
change is a leading source of uncertainty in climate sensitivity, the planetary warming
resulting from CO2 doubling. Here, we observationally constrain this low cloud feedback at a
near-global scale. Satellite observations are used to estimate the sensitivity of low clouds to
interannual meteorological perturbations. Combined with model predictions of
meteorological changes under greenhouse warming, this permits quantification of spatially …