You have 10 seconds to come up with a scenario in which colonizing mars is preferable to building bunkers on earth or "terraforming" uninhabited land (the outback, the artic, the tundra, etc).
.... and 10. You didn't do it, right?
Even in the worst nuclear winter our planet is still 1 billion times preferable to mars colonization.

So can someone explain to me how this isn't all a massive PR stunt?