Photos: BMW Hydrogen 7

BMW is taking a different approach to hydrogen than most other auto makers. Rather than developing a fuel cell-powered electric drive train, the company has adapted the existing combustion engine of its 7-series sedan to be able to run on compressed hydrogen and gasoline. The result is a dual-fuel car that can run solely on hydrogen. We took it for a ride this week among the rush-hour traffic of downtown San Francisco to get a taste of the hydrogen highway of the future.

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