Wow!
You guys have done your homework. I'm almost embarassed to comment with my hillbilly vocabulary.
Regardless, global warning by man or not, we must reduce emissions/pollution any way we can. It's just the right thing to do.
Based on reports/data/credibility/validity of "experts" or other researchers, it's difficult for me to determine what percentage of global warming is man made versus natural cyclical global climate trends.
I heard a rumor, please tell me if you have an idea, that if a major volcano erupted on earth, it could eradicate several years of man-made resolutions and successful efforts that have or will contribute(d) to the global warming trend.
Don May