Hydrogen Bicycles?

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Hydrogen is no more efficient than modern gasoline engines. Maybe a bit better than small gas engines? 25% is not much compared to electric motor systems at 70%.

http://www.alternative-energy-news.info/hydrogen-fuel-cell-bikes/
http://www.ecogeek.org/content/view/945/
Hydrogen can explode if there is oxygen present in the container.
http://www.wildnaturesolutions.com/hydrogen.html
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