First ask yourself how quickly you could build a self-sustaining society deep in the Sahara, or at the south pole. Then realize that both of those places are w

First ask yourself how quickly you could build a self-sustaining society deep in the Sahara, or at the south pole. Then realize that both of those places are waaay more habitable than the surface of Mars, since they both have a breathable atmosphere and a notable lack of perchlorates in the soil.