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We're at the bottom of a deep gravity well. The vast majority of us are never getting out of the well - unless you're talking about after a population collapse.

Thankfully, we're based on replicators - we could colonize the galaxy by sending out only small numbers. But barring some very far-future tech, each fertile world is going to carry a large immobile population, and we're going to have to learn not to trash planets.

I like the positivity, but the clean energy needed to set up 90% of the population off Earth with a quality life, won't be available any time soon.

Clearly, the right short term solution is to freeze people.

I never get this thought pattern - how would humanity be able to colonize other planets that are not liveable if we cannot even sustain living on our own?