I used to be a really big fan of his work, but after I found out he basically charges thousands for spreads for corporations despite his whole FUCK DA MAYNE stance, I lost a lot of respect for him.
To Louise: Humans are contributing. It was announced on February 2, 2007 by the IPCC that they were 90% sure that the climate change was due to human activity.
Here's some more info:
http://www.sciam.com/article.cfm?articleID=83D2B666-E7F2-99DF-32FD8CC329BC0535