According to the US
Department of Energy, Hydrogen (H2) will play an important role in developing
sustainable transportation in the United States. It is the simplest and
lightest fuel. Hydrogen, in the future, may be produced in virtually unlimited
quantities using renewable resources.
Hydrogen has been used
effectively in a number of internal combustion engine vehicles as pure
hydrogen mixed with natural gas.
In addition, hydrogen is used
in a growing number of fuel cell vehicles. Hydrogen and oxygen fed into a
proton exchange membrane (PEM) fuel cell "stack" produce enough electricity to
power an electric automobile. It powers the automobile without producing
air pollutants and few greenhouse gases.