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Basically liberating hydrogen from water is very energy intensive. Ed is right that this is what makes hydrogen economically unattractive as a primary fuel source. You need a lot of cheap electricity to really make it work. There are some schemes but they generally involve either nuclear power or some technologically extreme power source. Ocean thermal energy conversion systems and giant,orbiting solar arrays are two ideas that come to mind,and that kind of stuff ain't happening anytime soon. There's also the problem of hydrogen storage,requiring either cryogenic tanks or high pressure vessels. <br /> Petroleum based fuels are the cheapest thing around,which is why oil is king.
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