Neil Degrasse Tyson on the Joe Rogan Experience brought up the point that no matter what we do, it will be more realistic to focus on fixing/prolonging our time on Earth than leaving would be. I think that makes sense.
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Yes, I have heard him say that a lot. But I kind of disagree with him. Yes, we need to focus our attention at fixing problems on Earth, but there are enough of us that we can do both. Solving problems here on Earth, and colonise other planets.