I'm not taking sides, but wanted to post another viewpoint from an "expert."
http://www.desmogblog.com/richard-lindzen
Richard S. Lindzen is the Alfred P. Sloan Professor of Meteorology at the Massachusetts Institute of Technology (MIT).
Richard Lindzen's scientific stance on climate change and anthropogenic global warming is that the earth goes through natural periods of global warming and cooling.
According to Dr. Lindzen, the findings of the Intergovernmental Panel on Climate Change are problematic and limited because they are based on computer models which Lindzen says are "generally recognized as experimental tools whose relation to the real world is questionable."
Furthermore, he feels that the issue of global warming is completely political, and that policy makers and the media not only manipulate science but also force scientists to produce work that supports a particular agenda.