Random rant:
I’m so tired of this notion that people have that we’ll never solve our population problems until we colonize the moon or mars or something. It also seems to be a popular premise in movies and such.
What the hell are you thinking?
If we start putting cities on the moon, you’d see a few hundred thousand residents at the absolute most, I’d imagine. And they’ll probably be reproducing too, for that matter - and so will people on earth.
Even if you terraform mars or something, and put 500 million people on there (and that’s such a huge stretch to assume), so what? People on Earth keep breeding like they always have, and those 500 million people that left are replaced in a few years. Besides, then THOSE people will begin reproducing and overpopulating THAT planet.
What the hell are people thinking?
The only plausible way that colonization would solve any population issues is if we somehow develop a magic system that moves hundreds of millions of people magically between planets, find a suitable planet, and sterilize 80% of the everyone, or something.