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lol thanks? personally I think hydrogen is going to be a bit difficult because of storage issues. CNG is great as a fuel too, except it has basically the same problem just not as bad, which is a huge shame since methane is insanely easy to find.
I remember corn doesn't yield very much ethanol and isn't cost effective, so I don't think that's an option for sustainable fuel, until more effective processes mature. There's probably hope in more ethanol fuel though.
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