Some interesting points guys, but i'm amazed no one has yet mentioned the most obvious and real cause of global warming, and its got nothin to do with cfc's, cars, industry or any other reason Tony Blair can think of to tax uk motorists to death! quite simply the earth doesn't move in a true circle around the sun, it moves in eccentric circles (think of the kids drawing toy 'spiragraph') and over periods of millions of years moves closer to and further away from the sun, hence ice ages and global warming!! its easy really! the place i live (Derby, England) was under water 150 million years or so ago, and will be again one day due to this natural phenomenon of global warming, eventually there will be another ice age followed by more global warming, i mean think about it, how d'ya all think we came out of the last ice age? it certainly weren't with the help of cfc's and the internal combustion engine! THE ONLY reason ANY government can even spell global warming is caus global warming equals an excuse to scare the s**t out of everyone so therefore screw you all out of more taxes, believe me folks, all the taxes in the world AINT gonna stop nature!!