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humans only have a billion years left
on earth. at which point, the ever-expanding sun will have evaporated the oceans.
by this time, mars would make a nice home. it would probably look like earth (plants, water and an atmosphere) and we could easily live there. in about another billion, what next. we're fucked?
excluding of course the much more likely scenario in which we die off much earlier, probably in a few thousand years 
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