In the years of 2000-2003 I would have very much agreed with you on this. But right now I have completely lost faith in anything that does not run on fossil fuels. Even radiation is not a very effective energy source. If we can find something else that can be contained, distributed and dispersed as well as petroleum, then maybe that will work.
As for Solar airplanes, like boats, jet ski's and other sports utilities, not many people will be able to own one.
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