My only comment about this topic is that the Earth has always gone through heating and cooling phases. That is why there have been Ice Ages & Dust Bowls. Why have you never heard Al Gore mention these facts? Because they do not support his agenda. Was the last Ice Age ended because all of a sudden Cromagnon Man discovered fire and caused rampant Global Warming or were they secretly hiding cars in their caves? And remember, Greenland was named Greenland because when the Vikings "discovered" it, it was just that - GREEN. A few hundred years later, not so green anymore. Guess what, it'll probably become green again sometime in the future whether or not we all start driving Prius's or not.