Well! This is a volatile issue. There has been;
1. evidence that the planet has been getting warmer, butHow do the proponents of Man-caused Global Warming react to this evidence. For evidence set one the followers of Gore cite this as proof that we have screwed up the planet. For evidence set two the Goreites simply state that data collection is more accurate now. For data set three the data is irrelevant.
2. in the 70s there was ample evidence it was getting cooler. And
3. the last twelve years have evidence that the planet is getting cooler.
Then there is the evidence of the countries following Kyoto having increased their CO2, while the US not following has reduced theirs! That is hailed as fiction. Yet the guess by some body of people that doing nothing will cost 28 trillion per year.
What happens if the Goreites get their way and there is a wholesale reduction in CO2? Where does our O2 come from then? And who is to decide what the proper temperature is for this planet? And what if they pick the wrong one?