What about the warming that got us out of an ice age? Or what about the cooling that got us into an ice age in the first place? Were those all man made problems? If the earth doesn't experience warming and cooling trends on its own, then how did these events happen without automobiles, coal fire power plants and industry pumping huge amounts of CO2 into the atmosphere. Now don't interprete that to mean I am for pollution, quite the contrary, I hate pollution, I think we should take any chance we get to develop cleaner more efficient energy sources. However they need to be economically viable and not forced on the masses.