Yes, there are numerous threads on the topic already. I'll list several below, and additional discussions can be found via the forum's search function. Feel free to peruse/participate in the existing threads:

Global Warming: Real or not?
Trickery - stifle scientific evidence on Climate-Change ?
The AGW debate: Global warming
CO2 and global surface temperature. (GW Debate)
Is Global Warming a Solar System wide Phenomenon?
More on global warming...
What's with the animosity towards Climate Change advocates?