Earlier quoted context omitted.
I think it's a fantasy of the elites. There is no planet B. Not in the time frame we talk about. By far.
I agree that it's a fantasy. For one, I think Mars is just a power play by the likes of people like Musk and Bezos. It doesn't even make sense to view Mars as a backup for Earth because, at least currently, Earth is still alive and Mars is already completely dead. It's like saying "we're going to kill off the only planet that can sustain us to get to a planet that cannot sustain us". It's mind boggling that we can ge…
There's also the problem of surface radiation. Given that we can't figure out how to build subterranean cities at scale on earth, I'm not sure what the plan is for dealing with that.
Honestly, a self sustaining space station seems easier to achieve than a self sustaining Mars base:
You can spin the space station up to 1 G, park it behind a celestial body that acts as a radiation shield and power it with nuclear, or beamed solar power.
Maybe I'm missing something obvious about the relative difficulty of the two problems.