A paper published today in Earth System Dynamics finds that due to large uncertainties and limited data it is not possible “to rule out either the positive [cloud] feedback present in most climate models or a strong negative cloud feedback.”
This huge unknown could alone be responsible for all global warming due a tiny 1-2% natural change in global cloud cover. Climate models conveniently assume clouds are a positive feedback that accelerates global warming, but this paper and many others show this is an unjustified assumption and that cloud feedback could instead be “strongly negative.”
