I have a hard time seeing any benefit to colonizing Mars without coupling it with a large-scale attempt at terraforming. If we're going to just put a domed colony somewhere, the moon makes far more sense.
I'm much more optimistic about putting more robots in space, such as Planetary Resources is working towards. As it becomes easier and cheaper to extend our virtual fingers outside our gravity well, we can eventually create places that are truly habitable for humans, and which sustainably scale.
I'm much more optimistic about putting more robots in space, such as Planetary Resources is working towards. As it becomes easier and cheaper to extend our virtual fingers outside our gravity well, we can eventually create places that are truly habitable for humans, and which sustainably scale.