Observation is that global cloud cover decreases as warming increases. The assumption made by IPCC climate models is that increased CO2 warming causes cloud dissipation, a positive feedback response since less clouds let in more sunlight, further increasing warming. Correlation, however, is not cause and effect. If the dissipation of cloudiness primarily causes warming, a negative feedback response, climate is insensitive to carbon dioxide increase. To make matters even more complex, there might be two directions of causation: temperature causes clouds to change, and clouds cause temperatures to change. Even IPCC admits cloud feedbacks remain the largest source of uncertainty in predicting global warming. Seems we might want to resolve this cloudiness before tripping a multi-trillion dollar economy offline curing a problem that may not exist—unless, of course, the solution is the desired end, and the other just the reason that sounds good, not the real one.
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http://www.drroyspencer.com/2009/03/set-phasers-on-stun/
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