Part of the problem of this debate is that very very people have any real science accumen. This issue involves a multiple of other disciplines and as some real scientists have written, is a very complicated interaction. The enviro-wackos have attempted to simplify it - blaming man for a perceived problem. All the while, its just the Earth going thru its phases of interaction with the Sun.
Its all a very clever ploy by the left when very few understand science in the first place.