Forbes.com: "In the U.S., towns in Kansas and the Dakotas face extinction mainly because of an exodus of young people. Some Kansas towns are fighting back by giving away free land, with mixed results.
But some bigger centers also face the risk of annihilation. Urban planners across Europe and North America are already grappling with what to do with 'shrinking cities.' After the fall of the Berlin Wall in 1989, millions of residents of what had been East Germany moved west. More than a million apartments were simply abandoned.
In response, the German government sponsored the Shrinking Cities Project to study what is now a global phenomenon. The project has an exhibit on tour that examines shrinkage in Russia's Ivanovo, Leipzig in Germany, Manchester and Liverpool in Britain and Detroit in the U.S.
Whether these cities disappear entirely, of course, is an open question. Detroit's population has fallen by around a third since 1950 and now equals about 950,000. It is expected to shrink slowly but steadily until at least 2030; unemployment inside the city is more than 10%. (The suburbs around Detroit, meanwhile, are growing.) If trends hold, Detroit will be altered beyond recognition by 2100."