Personally I find it hard to believe that all the pollution being pumped into the atmosphere can't help but contribute to problems. But climate change prediction software has to have solid data to produce meaningful results: GIGO. A couple hundred years of data is hardly enough to produce incontrovertible results.
Personally I see no problem with trying to clean up the air and water, but nothing much can be done until the population growth curve can be leveled out. Until then it's just bandaid actions.