NSF admits that the science isn't settled

NSF Releases Online, Multimedia Package Titled, "Clouds: The Wild Card of Climate Change" - US National Science Foundation (NSF)

As discussions about climate change continue, one critical factor about this phenomenon has remained largely unknown to the public: the important but enigmatic role of clouds in climate change. The role of clouds is important because at any given time about 70 percent of the Earth is covered by clouds. The role of clouds is enigmatic because clouds can exert opposing forces: Some types of clouds help cool the Earth and some types of clouds help warm it. Which effect will win out as our climate continues to change? So far, no one is certain.