If The Whole Country Was Brooklyn
According to some urban planners, if the entire USA lived with the same population density of Brooklyn, we could all live in an area the size of New Hampshire. The rest of the nation would become farmland and parks and there's be little need for domestic air travel. And we'd all ride our solar-powered hovercycles to our sustainable green office towers where we'd micro-farm our lunch salads.
(Via - Andrew Sullivan)