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Because hydrogen is made up of water and oxygen, these vehicles produce almost no harmful emissions.
Hydrogen vehicles have been criticised, however, for using very high inputs to produce the fuel cells or combustion hydrogen. Some countries, such as Iceland and Denmark, are using renewable energy sources to produce hydrogen.
Most researchers agree that it will be many decades before an efficient and economic way of producing hydrogen for vehicle transportation will become available, and that other hybrids are probably more efficient means of transportation than hydrogen vehicles. If you are interested in purchasing a hydrogen run vehicle, visit the following manufacturers:
Most of theses vehicles are still in research and development phases, though, so you may have to wait a while longer before driving a car which runs on water!