Where does the hydrogen come from though?
Electrolysis of water, which requires huge energy which means burning more fossil fuels.
Unless the hydrogen is created from things like solar, wind, or nuclear, it's probably more efficient to burn the gas directly in the engine than it is to burn the gas in a plant to create hydrogen and then burn the hydrogen in the car.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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