As I said in my previous posts, it's not that I don't believe global warming is occurring. Nor do I dispute that "greenhouse gases" are a major factor (50% according to this site) in the warming. Nor do I dispute that mankind is adding positive components to the warming.

What I don't know, however, is whether what mankind is adding is having any statistically significant effect. Here's an interesting read (that's not too technical) which implies we're just in a blip in the warming/cooling cycles that the Earth has been undergoing since the beginning. Granted it was written almost 10-years ago, but nonetheless it provides some perspective.

Nor do I have a feel for how linear and responsive the climatic system is... ie, does a very small change cause our climate to change radically or only a little across a wide/narrow range of conditions? According to my 2nd reference, mankind accounts for only .3% of the greenhouse gas... does that have any meaningful significance in the overall climatic equation? Does anyone know?

Finally, I find it really hard to find theories that I trust due to the preponderance of material that's simply the "emotional arm waving" of environmental activists, those who stand to make a buck by creating a panic mindset, and those who don't want to spend any money/change their way of living. Even when I do think a theory is plausible, I remind myself that we still can't forecast tomorrow's weather with better than a 60% a certainty.