<font color="blue">Global Warming ?? A very controversial topic as regards cause/effect with a split scientific community and definite political overtones. </font>
Egon -
While the illogical linking of apparent causes to perceived effects is indeed one of my "pet peeves"; as Judge Wapner would say, "I've heard enough, I'm ready to make my decision" on a linkage between global warming and man's activities. As far as a "split scientific community" is concerned, I'd point out that the scientific community is also split on evolution, string/M-theory, and the big bang.
Climatology is complex to say the least, but it is my belief that very little honest doubt remains that man and his activities are having significant "negative" impacts on the environment. Where politics enters the picture tends to be on the side of denial of the obvious, for selfish, short-sighted reasons. Your temperature may vary.