As always, there are rumbles of discontent from the scientific community with regard to global warming. This article (vile email registration required) from R. Timothy Patterson, professor and director of the Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, lays the overriding mechanism of climate change squarely at the feet of the various solar cycles. In the article, he explains that solar energy impacting the earth is part of the mechanism, while the sun's solar wind drives cloud formation in a complementary cycle that enhances the effect of the actual heat input. But that's not the kicker. The interesting part is he is predicting global cooling, rather than warming.
But wait; there's more. This months Discover Magazine (print version also) has a lengthy article about this same mechanism, that is, cloud formation driving the climate and the sun driving cloud formation by way of modulating the effect cosmic rays have, by Henrik Svensmark, the 49-year-old director of the Center for Sun-Climate Research at the Danish National Space Center in Copenhagen.
Svensmark says that we are in a warming trend, so his conclusions are at odds with those of Patterson; but they both agree that CO2 isn't nearly the looming threat that it has been made out to be with regard to climate change.