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Following up on Torby's comment above:

Yes, you have to ask where the energy comes from to run the compressor of an air car, or to generate hydrogen. Not just the cost, but the polution. The cars don't polute, but if the electricity is generated using coal or oil as most of it is, you move the souce of polution from the vehicle to the area around the power plant. This might be an acceptable tradeoff, but there's usually no "free lunch".
 
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