There is no scientific reason to think that we even with space travel are going to survive as a species for ever certainly not by biting off the hand that feeds us which is exactly what we are doing.
Sure we're in limos. We're stars. How else is a star supposed to travel?
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We all know we have a problem a broad problem. Ninety-eight percent of the fuel that is used by our vehicles our autos and trucks for personal and commercial purposes for highway and air travel operates on oil. The world has the same problem.