[Pepe1vo]

You know what's even less promising than a bunker on Earth? A bunker literally anywhere else in the observable universe. In fact, we could nuke the entire surface of the earth and it would probably still be easier to establish a self-sustaining colony on the resulting radioactive wasteland then on the Moon/Mars/Venus.

There is a very good reason why Earth is, and will continue to, sustain a great diversity of life and the rest of space is sterile.

[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?