What will it take for hydrogen cars, which emit only water vapour as exhaust, to hit the roads in large numbers? Filling stations would be a good start, as this video of the Hydrogen Road Tour shows.
Between 11 and 23 August, a caravan of hydrogen-powered cars travelled the US from coast to coast in a bid to raise awareness of the technology's promise.
Watch the video below to see hydrogen cars in action, hear what one sounds like and learn why more filling stations are urgently needed.
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