The story

For a century the gasoline engine has remained largely unchallenged, seeing off all pretenders to its crown. But with concerns about greenhouse gas emissions and a host of new contenders looming large in the rear view mirror, is the gasoline-fueled automobile due to be overtaken by a fleet of cleaner, leaner rivals?

CNN takes a look at the competition, from electric vehicles to cars that run on hydrogen, solar power and even air.

SCIENCE THAT WILL CELL? Read full article »

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