Expressed in the language of science, the paper does not generate a feeling of great alarm: “Equilibrium climate sensitivity refers to the ultimate change in global mean temperature in response to a change in external forcing.

“Despite decades of research attempting to narrow uncertainties,equilibrium climate sensitivity estimates from climate models still span roughly 1.5 to five degrees Celsius for a doubling of atmospheric carbon dioxide concentration, precluding accurate projections of future Climate. “The spread arises largely from differences in the feedback from Low clouds, for reasons not yet understood. Here we show that differences in the simulated strength of convective mixing between the lower and middle tropical troposphere explain about half of the Variance in climate sensitivity estimated by 43 climate models…

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