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By JonC (registered) | Posted September 10, 2009 at 10:49:32
To differentiate between energy sources and stores isn't really accurate. All of our sources are stores, some are more efficient, some are renewable and some we can create, but energy doesn't exist as a material form. It's the transition from one form to another that consumes or releases energy. Hydrogen typically isn't emitted in a pure enough form, so yes we do need to create and store it, but is that really different from refining petroleum or building turbines?
I don't think hydrogen will substitute for gasoline, mainly because the current car lifestyle will fade away as our energy sources wane and less efficient sources are consumed, but it will be important for industrial output in the future (think of hydrogen as a rechargeable battery, but with less hazardous material consumption).
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