[wongarsu]

Building a nice place on Earth to ride out climate change would be a lot simpler. But it also puts a massive target on your back. If society collapses, everyone will want in on your little Garden Eden, and no amount of fortification will be able to keep millions of people out. Nuking the entire surface of the Earth would solve that issue, but is generally frowned upon. Better to just build your bunker far, far away where most people can't get to it.

[jowea]

You see self-sustaining colonies outside of Earth in our lifetime? Wouldn't they need a massive industrial base, a variety of resources, large populations, etc to not need Earth?

[wongarsu]

Aren't you exactly describing Elon's proclaimed plans for a mars colony? Not a tiny lab like NASA would build, but an industrial base with thousands of inhabitants.

Is his plan realistic? Hard to tell. It's far beyond anything we have ever done, and financing such a plan is going to be challenging to say the least. And technologically we are also decades out. So I guess he better hurry up. But that's a different goal post that the one I set, a plan doesn't have to be easy or have probable success in order to be better than the other bunker plans.

[jowea]

Don't we need millions of people for a viable industrial Martian civilization? Honest question don't know.

Also, we haven't even been to Mars, unless SpaceX has some single-state to orbit spaceplane plus some fancy interplanetary engines in the works I'm not that optimistic. And who is going to finance this?

Honestly building a Fallout vault to wait the worst out seems easier.

[wongarsu]

The current idea of how to get there depends on launching Starships to earth orbit, refueling them completely using a bunch more Starships, and then going to Mars. In terms of energy required it should work out, but I have no clue how he is planning to pay for it beyond a small NASA colony.

On the other hand Mars hasn't been stripped of easily accessible resources in the same way Earth has been over the last couple thousand years. As an obvious example, Mars's surface is covered in so much iron ore that it dominates the color of the landscape. Iron isn't worth enough per pound to bring it back to earth, but if they find deposits of more valuable materials there might well be a mining opportunity that pays for the whole endeavour. Nothing brings in money, people and resources like a gold rush.

[jowea]

I don't know anything about Martian geology but wouldn't you need a large amount of travel around the planet to acquire everything an industrial civilization needs like resources for solar or nuclear power because it's lacking the easily accessible fossil fuels Earth had. And is it cost effective to mine on Mars and export? I thought using asteroids for that was easier.

And honestly, I don't think Musk is planning to do it, my opinion it's 60% marketing strategy 20% wishing for government funding for a small science mission 20% wishing the Mars colony happens somehow.