I'm with Rick on this. Global warming (and cooling) is primarily cyclical though there are a half dozen different influences on different time scales, some stretching over thousands of years. The science behind the phenomena seems sound enough, and sensibile enough, to me. I can also see that man's activities may be having a small effect on some of the clyclical influences but I cannot for the life of me see how man could be influencing such things as sun spot activity or the cyclical movements of the sun, moon and other planets.
What seems to be missing from the debate is the appreciation that these cyclical events happen over vast time periods of thousands or even hundreds of thousands of years and not just within the lifetime of any particular parliament!
Climate change is real and natural and the human race will have to adapt; apparently we're good at that.
This artice
http://www.ace.mmu.ac.uk/eae/climate_change/Older/Climate_Change_Introduction.html seems to offer a sensible overview of climate change.