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The fraction of hydrogen production that is based on renewable sources is quite tiny. And it is an intrinsically inefficient use of the energy. Hydrogen is not an energy source, it is more akin to a battery - a form of energy storage. And so long as it's produced mainly by consuming coal and natural gas it's a real stretch to call hydrogen-powered transport "non-polluting" except in the sense that the emissions of the vehicle itself are fairly benign.
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