Hydrogen is much safer than gasoline. Gasoline's self-ignition temperature is between 228-501degrees Celsius, (depending on the grade) while hydrogen has an ignition temperature of about 550 degrees Celsius. When a hydrogen spill occurs, the hydrogen gas becomes so meager that it cannot burn. On the other hand, gasoline, diesel vapors and natural gasses are heavier than air, so they remain flammable for much longer. Hydrogen is non- toxic, and naturally occurring, unlike all petroleum fuels. Hydrogen's only exhaust is water, which is safer for the environment and it is better for humans and animals to breath clean air without pollution contaminating it. Hydrogen is also very safe to store. The tanks that are currently being used to store compressed hydrogen are very safe. They have survived tests such as being shot six rounds from a .357 magnum, detonating a stick of dynamite next to them, and subjecting them to fire at 1500 degrees F. Obviously, an ordinary gasoline tank wouldn't survive any one of these tests. Yes, it is true that the blimp the Hindenburg was full of hydrogen when it exploded, but it was not actually the hydrogen that made the luxury air traveler catch on fire. The blimp ran into some telephone lines, and the electric sparks light the flammable outer shell. (For more information on this topic, please visit this site: http://www.hydrogennow.org/Facts/Safety-1.htm)