A Daimler photo shows the potential of a fuel cell car powered by renewable energy from wind turbines. The only exhaust from running fuel cell vehicles is water vapor. But to get hydrogen fuel in the first place, today it has to be created using fossil fuels. Many people over the years have pursued this vision of cars or the power grid running on renewable-energy sources, but as history shows, it's quite difficult and takes years of consistent work.
March 5, 2012 3:59 AM PST
Photo by: Daimler
| Caption by: Martin LaMonica
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