A second home for the species against every problem the money could solve on the first one.
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As insurance it is badly priced. Earth after an asteroid, a nuclear exchange or a pandemic is still more habitable than Mars on its best day - more air, more water, a magnetic field. If the goal is a surviving human population, hardened shelters here cost a fraction of it and start working immediately.
A self-sufficient colony needs closed-loop life support that has never worked on Earth for more than about two years, in 38% gravity whose effect on a pregnancy is entirely unknown. The backup-planet argument requires the backup to work. We currently cannot keep eight people alive and fed in a sealed building in Arizona.
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