The problem is that little involving the popular notion of climate science actually involves real science. Despite what the Gators and Baskins of the world say, you can't make static declarations in a field of science that's as new and as fluid as climatology. The two leading governmental agencies involved in the studies - NASA and NOAA - are both younger than I am. To say that you can ascertain with any confidence what humanity's effect may or may not be, either short or long term, is not only arrogant in the extreme, it's really, really #@%&ing stupid.
I'm willing to concede that our way of life may have an even greater effect on global climate change that what some adherents believe, but the truth is that we're too far away from truly understanding this particular field of science to make a determination either way.
But there will always be people who are so easily duped that they'll defend anything.