clean cars

Hydrogen as a gas on its own is dangerous, just look at what happened to the Hindenburg Airship. Used as part of a fuel cell, then the hydrogen can be produced when it is needed, water breaks down chemically to Hydrogen and oxygen, so this is much safer. Even stored in a hydrogen tank is not as dangerous as it used to be. Petrol stored in a petrol tank can be dangerous as well, even gas for caravans is stored in cylinders. Unlike the liquified petroleum gas (LPG) which can be bought at many garages,and stored in a gas cylinder in the car, Hydrogen gives a much cleaner waste product, only water, whereas LPG gives out hydrocarbons, CO2 and CO as well.