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@cstross @jannem @futurebird @dx I've long thought the concept of settling Mars was ridiculous - there is nothing there to settle it _for_ apart from Lebensraum.
I thought the most likely way to get permanent settlement on Mars would be if we were mining the asteroids and Mars was first settled as an R&R centre that was closer. There might then be some discovery of some resource that is economic to work on, but not short of that!