Frequent readers will know that I have often criticized climate scientists for assuming, without strong evidence, that climate is dominated by positive feedback. Such an assumption about a long-term stable system implies that climate is relatively unique among natural processes, and is a real head scratcher when advocated by folks like Michael Mann, who simultaneously claim that past temerpatures are stable within very narrow ranges (Stability and positive feedback are two great tastes that do not go great together).
Well, it seems that those of use who were offended by the notion of a long-term stable natural process being dominated by positive feedback may have been right after all (via Tom Nelson):
Cirrus clouds are performing a disappearing act which is taking scientists by surprise.
In the global warming debate, it is assumed that temperature rises will lead to more rainfall, which in turn will see an increase in high-altitude cloud cover that will trap infrared heat.
But research on tropical climate systems has found the opposite is happening, with cirrus clouds thinning as the air warms, leading to rapid cooling as infrared heat escapes from the atmosphere to outer space.