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For the environment, hydrogen is not the answer. Hydrogen must be freed from water. To do that an electrical current is passed through the water seperating it into its components oxygen and hydrogen. The amount of energy needed to do this is greater than the energy potential in the hydrogen and oxygen generated. To switch all cars to hydrogen, more oil would be required. Not less. Unless you use another new source of energy (such as solar which at this point wouldn't be practical) to generate the hydrogen.
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