[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.