Earth's climate over the last 65 million years
Global warming is changing the world we know and love. But in fact, the Earth's climate has changed many times - especially in the last two million years, when a series of ice ages has wreaked havoc worldwide. We need to understand the past to have any chance of understanding the future... so here's a little tale of the Earth's climate. If you prefer charts to words, scroll down!
Rest of this long article, ALOT of data:
http://math.ucr.edu/home/baez/temperature/