"Japanese car manufacturer Honda has begun the first commercial production of a zero-emission, hydrogen fuel-cell powered vehicle.

The four-seater, called FCX Clarity, runs on electricity produced by hydrogen, and emits water vapour.

Honda claims the vehicle offers three times better fuel efficiency than a traditional, petrol-powered car. "

"One of the biggest obstacles standing in the way of wider adoption of fuel-cell vehicles is the lack of hydrogen fuelling stations."

http://news.bbc.co.uk/2/hi/business/7456141.stm