Car sharing is essentially renting cars by the hour. This type of transportation solution is regarded by many as the future of automobile ownership, especially in cities. There are already more than 100,000 car sharers in Europe.

Boston-based Zipcar http://www.zipcar.com/, now in East Lansing and Ann Arbor, claims to be the world's largest and fastest growing car sharing service, operating in London and 14 North American states and provinces.