WebsterMark is right.
Just go back to your 3rd/5th grade schoolbooks and you'll find that 100,000 years ago the Temperate zone was cooler, rainier, greener, with saber-toothed tigers and mammooth elephants.
I'm not making this up, just go and research at your nearest Museum of Natural History.
Historical records have it that, for example, Timbuktu was the capital city of a green, luscious and fertile area no more than 1000 years ago.
Pisa was a seaport, now it's 15 km inland (it's silt from the river, not receding sea level)
Links courtesy of Verslagen showed, some time ago, that there are records by paleontologists and paleometereologists to show that there are at least three different weather cycles, one lasting about 4000 years, one 12,000 years, one 120,000 years.
By sheer coincidence, we are now antering a perdiod where all three cycles meet in a common, overlapping high, producing temperatures which tend to rise year after year.
Some 60,000 years ago, the world saw a common, overlapping trough (=low) resulting in a few centuries colder than usual, in the middle of an ice age.
So, what do we do, blame GM and Toyota for global warming?
In proportion, it's like blaming your flashlight because the sun is setting...