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a semi-utopian world would maybe exhaust resources on planet quickly OR environmental impact too much and they focus really hard on mining asteroids. but after the bombs, the people up mining asteroids on colonies etc would still be there, but have no like… docking station w/ever to return to. of course, some tried, but they were forced to crash-land on an irradiated earth
those who didn't live in isolated colonies.
- do they know and how much?