About half way down this page, there is a neat little graph that shows the temperatures recorded in one of the ice core sites in Antarctica....roughly 400,000 years worth of info.
http://earthobservatory.nasa.gov/Study/Paleoclimatology_IceCores/
It's an interactive graph, so not only is it informative, but fun to play with as well.
Personally, I do not buy into the highly popular notion of "global warming" or at least the fact that we are solely responsible for it....the burning of fossil fuels and such.
The Earth is warming, yes...sure...agreed....but at some point she will cool, all on her own accord, and if we are still here as a species, there won't be a damn thing we can do about that either.
Epochs, ages and eras....not decades, centuries, or millennia.