"Forget hydrogen. Forget hydrogen. Forget hydrogen!" That was the rallying cry of Jim Woolsey, a former director of America's Central Intelligence Agency, at an energy-technology event this week in Washington, DC. He was referring to the idea that America might make itself less dependent on foreign oil by encouraging the development of hydrogen-powered cars. Instead, the former spy-chief has joined a curious coalition of environmental activists, national-security hawks, clean-energy experts and politicians to unveil a national consumer campaign in favour of "plug-in" hybrid-electric vehicles.
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