Alan Ohnsman Bloomberg News Comments Hydrogen fuel cells have long been seen as a potentially perfect way to power a car: They generate electricity and emit only water vapor. While a few cars have been tested, Toyota Motor Corp. is about ready to roll. The automaker that defied skeptics in the 90s with its Prius gasoline-electric hybrid cars is looking for a fuel-cell sequel. At the Tokyo Motor Show in November, it plans to show a hydrogen-powered sedan that would be sold as a 2015 model. It could be available in U.S. dealerships as soon next year for a price comparable to a mid-size BMW or Tesla Model S. The allure of hydrogen, the most abundant element in the universe, as a clean gasoline...
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