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water doesn't count because there's no way to get sufficient quantities of energy from water without heating up the water. Heat up the water, you kill the fish, and you're screwing up the environment anyway.
Solar: Do you have any idea how big a solar farm would have to be just to power hydrogen cars in ONE state?
Wind: See solar. The problem with solar and wind is that you have to have a large collection apparatus (windmills / solar farms) to get even modest amounts of energy. You need a HELL of a lot of energy to crack molecules to get the hydrogen out.
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