Another thing preventing the release of many alternative fuel sources is that oil companies are snapping up Patents for engines that use alternative fuel sources, due to their stubbornness to change their assets around.
Hell, I was talking with my Uncle a while back, and he had actually drawn up the plans for an engine that would seperate the hydrogen from water (forgot the term for that), burn it as fuel, and have a recondensing chamber to minimize water loss as well. Problem was that he was in the Army at the time, and legally anything you invent while in the Army can be patented by the Government.
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