See related story: Green Cars Strive to End Oil Era

The one-seat Sparrow gets its energy from a solar panel and wind turbine that can be stowed in the trunk.
Courtesy of Clay Turnbull, NESEA.org
Western Washington University spent $1 million to design the Viking 23 from scratch.
John Gartner
Tulsa students built this 2,250-pound car's frame out of plastic tubing and carbon fiber.
John Gartner
A sunny day provides enough charge to drive 15 miles in this solar truck.
John Gartner
GM's pickup has two electrical outlets under the back seats and in the rear of the bed.
John Gartner