Uh, you're both completely missing the picture I think. If we can figure out how to survive on Mars, which is "uninhabitable", then we can apply many of the sam

Uh, you're both completely missing the picture I think. If we can figure out how to survive on Mars, which is "uninhabitable", then we can apply many of the same technologies on Earth even if it becomes "uninhabitable". Technological progress seems to almost always proceed by doing "cool stuff" and "hard stuff" (or at least "war stuff") and then applying the advances to the mundane. Musk knows this. He gets to do the cool stuff, humanity benefits; the two don't have to happen in the same way. His worldview says this is an ordinary and morally good way that people benefit from each other; even though this seems incomprehensible to more... collectivist worldviews.