How Now Brown Cloud
Daniel Drezner links to a Chicago Tribune story about the Asian "brown cloud", contaminated air that moves around the world and has scientists theorizing about its effects. Ironically enough, the so-called brown cloud produces white clouds in the atmosphere because water droplets more readily form around the particulates in the cloud.
For me though, this paragraph from the Trib story says it all:
Some researchers, in fact, think the extra-white clouds caused by dirty air are helping to offset the global warming effect. That would offer an explanation for the unsettling fact that "the planet hasn't warmed as much as the models suggest it should," given the amount of greenhouse gas that humans have released into the atmosphere, the researcher said.
Alternate analysis: since so few of these "models" have proven of any predictive value whatsoever over time, maybe the researchers should simply admit that they don't have a clue about how to model the climate and accurately make these predictions.