[twinkletwinkle]

I don't think so. In terms of room and resources we could just as well colonize Antarctica.

[blacksmith_tb]

There's a lot of undersea real estate, too. Both environments are less hostile than Mars, practically speaking. But of course neither cover the 'backup planet' scenario - and they don't put you out of reach of regional political struggles.

[mkempe]

I will applaud (and support) both of you when you colonize Antarctica and the sea floor. What's your plan, timeline, and source of financing?