[ExI] How will air travel work in a green solar economy?

[John Clark]

In looking over my calculation I see that I made a mistake, I forgot to
include the fact that the efficiency of a jet engine is not 100%, 50% would
be more like it.  So the factory needed to provide the fuel to keep just
one 747 in the air would cover closer to 6 square miles of the Earth’s
surface than 3 as I originally said. And that my friends just isn't
practical.

  John K Clark
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