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A hydrogen vehicle is an automobile which uses hydrogen as its primary source of power for locomotion. These cars generally use the hydrogen in one of two methods: combustion or fuel-cell conversion. In combustion, the hydrogen is "burned" in engines in fundamentally the same method as traditional gasoline cars. In fuel-cell conversion, the hydrogen is turned into electricity through fuel cells which then power electric motors.

Hydrogen can be obtained from decomposition of methane (natural gas), coal (by a process known as coal gasification), liquified petroleum gas, biomass (biomass gasification), high heat sources (by a process called thermolysis), or from water by electrolysis. Irvine, CA 92618. A primary benefit of using pure hydrogen as a power source would be that it uses oxygen from the air to produce water vapor as exhaust. Another benefit is that, theoretically, the source of pollution created today by burning fossil fuels could be moved to centralized power plants, where the byproducts of burning fossil fuels can be better controlled. Hydrogen could also be produced from renewable energy sources with no net increase in carbon dioxide emissions. However, as explained below, the technical challenges required to realize this benefit may not be solved for many decades.