I'm a geologist among other things. I've been hearing about this my whole life. Next Ice Age is coming, which makes sense. We are in an interglacial warming period. Last time the earth didn't have ice caps was about 40 million years ago. Now we have to worry about global warming. The way I answer people that start yelling at my when I tell them I don't think we are making a difference is "about 20,000 years ago there was 5,000' of ice sitting on top of Chicago. Where did it go and why? The Great Lakes are the remnants. "