About seven years ago I read a fascinating paper by Roy Spencer et al. that argued that clouds respond to Earth's surface temperatures in ways that moderate them--cooling the surface in response to warming, warming it in response to cooling. It led me to an earlier paper by Richard Lindzen that argued that, at least in a major region above the Pacific, clouds respond to surface temperature changes in a way analogous to how the human eye's iris responds to light. In response to dimmer light, the … [Read more...]