YOUR NEXT CAR WILL BE A VOLT:

Concerned about slow sales of electric cars and plug-in hybrids, automakers are increasingly betting the future of green cars on hydrogen fuel cell technology.

Even Toyota Motor Corp., maker of the popular Prius gas-electric hybrid, will use hydrogen instead of batteries to power its next generation of green vehicles.

"Today, Toyota actually favors fuel cells over other zero-emission vehicles, like pure battery electric vehicles," said Craig Scott, the company's national manager of advanced technologies. 

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