Discussion
Which constraint limits the increase in global mean precipitation?
Answer: D
Precipitation must balance evaporation, which is limited by the energy available at the surface, so the global mean can rise only about 2 per cent per kelvin against the 7 per cent increase in moisture. The divergence between the two rates means the extremes intensify faster than the mean while the residence time of water in the atmosphere lengthens. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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