Car sharing is an energy-saving idea whose time may have come. For a couple of bucks an hour, on top of a monthly or yearly membership fee, you can hop into a clean, gassed-up car and drive it as long as you like--and never pay for insurance or a single oil change. Companies like ZipCar, which is based in Cambridge, Mass., and expanded last week into Washington, maintain fleets of cars parked in convenient locations around town. Customers can pick up a car, drop it off when they're finished, and pay only for the hours they drive. The only downside: no...
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