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the hydrogen comes from methane. The energy to release the hydrogen from the methane comes from fossil fuels and nuclear power.
While a fuel cell is very efficient in using the stored energy in hydrogen, the process to GET the hydrogen is grossly inefficient. The net result is that you expend less energy just using gas than you do making the hydrogen, then using the hydrogen. Hydrogen cars are a scam fronted by the oil companies because methane is found in oil wells and is cheaper to get than oil is - so the oil companies don't have to buy new land in order to make huge new profits.
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