From a scary article in the New York Times:
"Adaptation -- the peaceful shifting of food-growing areas, coastal populations and so on -- seemed possible, if difficult, when abrupt change meant a few degrees in a century," he wrote. "It now seems a much more formidable task, requiring global cooperation with swift recognition and response."
The new studies found that the average global temperature can change as much as 18 degrees Fahrenheit in a couple of decades during interglacial periods, Dr. White said. The current average global temperature is 59 degrees Fahrenheit."
The interesting thing about this is that this article is from 1993, and is referring to climate events 250,000 years ago. Damn, did cavemen have SUVs?