Many know that the Great Lakes were formed from the melted left overs and scouring of various glacial periods. What many people in Ohio do not know is that the current course of the Ohio river on the state's Southern Border constitutes a very young location for a major river, probably one of the youngest in the world for a major river as large as the Ohio. Prior to the Glacial Periods of the past 100,000 years (BTW - we are still in an Ice Age), the Ohio River ran from Southeast Ohio and ran in a Northwesterly direction toward Findley, OH and across Northern Indian and Illinois until it reached the Mississippi River (Called the Teays River). The various Glacial periods wiped this old river bed out and moved the Ohio River South to its current location. Pretty interesting stuff, but I would not want to witness it. Of course, it probably wouldn't effect the job situation in some of our rotting cities.
I would bet that even the most ardent AGW libs would do an about face on their position if they looked outside their northern windows and saw a ten thousand foot high wall of ice. I really want to find the people who would like colder weather in the northern states.