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I think colonisation of Mars will happen within the next 600 years. First I suppose we'd live in the kind of stations they have on the moon but I imagine eventually we could terraform the planet, of course we'd require a substantial amount of carbon dioxide in the atmosphere and some cheap way to bond hydrogen and oxygen together to form water. Currently it's not viable to do that kind of thing.
Oh BMMMMMM?
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I'd like to see it happen for reasons of awesome, challenge and adventure, but I am unclear on the point of it, beyond those reasons.
But there are things we can't change about Mars. Gravity, for example. And the lack of a significant magnetic field. The vulnerability than caused it to lose its thicker atmosphere has not gone away, and I don't know that that can be rectified. Any teraforming is likely to require maintenance, or else it will be relatively temporary. Even if you can get around that, there are no plate tectonics. This leaves the carbon cycle incomplete, as all the carbon that ends up at the bottom of any oceans when the plankton dies is going to stay there forever. On Earth is ends up become rock such as chalk and eventually being subducted beneath a continental plate, to be returned to the atmosphere by volcanoes. On Mars, plants will starve and temperatures will drop. Again.