[cogitator]

How? Models that show an increase in water vapor coming from the increase in CO2. The slight (very slight relative to other gases) warming from CO2 allows the atmosphere to hold more water vapor. This much more potent GH gas then causes further warming. The problem with those models is the assumption that clouds can be described with a single parameter ignoring or trivializing the effect that the increased water vapor has on the weather.

Sorry for the long Easter weekend delay.

Clouds and aerosol effects are the single largest source of uncertainty in global warming predictions/projections. And there's no doubt about that (insert Mona Lisa smiley here)

[palmer]

Clouds and aerosol effects are the single largest source of uncertainty in global warming predictions/projections.

Short run probably true. In the long run there are much bigger effects from the sun, wobbling, magnetic fields and geological phenomena.