Sorry guys. I hate wal-mart and all, but the end of oil won't stop the world as we know it. The rich-and-powerful of the world won't let a little thing like lack of oil bring us back to an agrarian, communalist utopia, unfortunatly. There will be a big economic depression. People will lose their jobs, be stuck in the suburbs unable to buy food, etc. Then we'll go to war with somebody, and the economic stimulus of the war will cause massive investments in nuclear plants, which will of course be located in low-income and minority neighborhoods. This is America.
This nuclear energy will be used, among other things, for splitting water molecules into hydrogen and oxygen for hydrogen fuel cells. Hummer Hydro (R) anyone? Any while we won't be burning gas and making CO2, who knows what all that water vapor will do to the climate...