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London's hydrogen buses grounded during Olympics due to security fears

Is hydrogen a dangerous substance? It is, during the London Olympics, at least. That's why the fleet of five H2 buses that usually carries passengers between Covent Garden and Tower Gateway have been sent out to pasture for the duration of the games. Standard diesel buses will replace them.

Video: Hydrogen-powered buses in Hamburg are fueled by the wind

Hydrogen bus in Hamburg - Click above to watch video after the jump