Recently Paul Krugman in NY Times made an insightful point I think: The most efficient transportation system in the world, is the ELEVATOR.<p>So just build taller buildings in a small area like Manhattan, there is plenty of space up there, it is cheaper that way and no need for roads and automobiles to move from one floor to another.<p>Living in a city is more humanistic anyway because there are more humans around you. There is no reason not to grow food in the sky-scrapers too. The only reason it is not done more is the zoning laws, which should be changed.