> If we can make Mars habitable, we can make Earth habitable for far less cost. I'd put it slightly differently. If we can't keep earth habitable, when we're s

> If we can make Mars habitable, we can make Earth habitable for far less cost. I'd put it slightly differently. If we can't keep earth habitable, when we're standing right here on it, what hope do we have of making Mars habitable? Never mind logistics, look at the billions of years of evolution that led to billions of interdependent organisms. We are one of those organisms, but in our guts alone live countless more. As a tech person, have you ever built system A, then built system B which depends on system A. And then, when the both up and running, accidentally modified A to depend on B? And that's just 2 systems. Scale to billions. How the hell do you cold-boot that?