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1) use solar energy to break sea water into hydrogen and oxygen. You could lay out vast sheets of solar cells on teh ocean surface to do this on a vast scale. Have them far enough offshore and it's not even an eyesore. 2) cap waste burial sites and use the methane that occurs naturally. A lot of times it is burnt off anyways. I think that you'd have to at least have the hydrogen in a liquid state to get any range at all. Ideally you need to store it interstitially in the matrix of a metal. you can store more that way than in a compressed liquid form, and it is totally non-volitile. The problem is gettng the metal to give up the hydrogen at a decent rate, and to recharge the metal matrix at a decent rate.
Mike ------------------------------------------------------

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