A little more than a decade ago, hydrogen fuel cell vehicles appeared poised to challenge hybrid and battery-powered electric vehicles as a green alternative to gasoline-powered cars and trucks, but the hydrogen revolution never happened. Although EVs come with their own complex issues, the lack of a hydrogen refueling infrastructure and the flammability of hydrogen gas doomed that technology as a viable consumer alternative. Only about 15,000 hydrogen-powered vehicles are on the road in the United States, and all of
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