Photos: Volkswagen HyMotion fuel cell vehicle

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Volkswagen showed off its fourth generation fuel cell research vehicle in San Francisco, making its North American debut. This vehicle, built into Volkswagen's new Tiguan crossover model, uses hydrogen to create electricity, providing power for the car's electric drive motor. It also has a lithium ion battery pack for extra electricity storage, and gets the gasoline equivalent of 42-to-62 miles per gallon. A Volkswagen spokesman predicted a consumer version in 7 years to 10 years, when a hydrogen refueling infrastructure is built up.

Click here for photos of the Volkswagen HyMotion fuel cell vehicle.