My wife is practically minded, so she rightly points out when things aren't practical, like going to space.
Of course, sustaining human life outside of Earth is completely impractical... until it isn't.
That said, we aren't even extensively utilizing living on the oceans, or in them, or in the ground. We're just scratching the surface at the moment.
One thing Scott Adams brought up is that we could build spaces that were inviting regardless of where they are located. If we had walls that were "screens", our view could be whatever we wanted, even if living underground. Cities underground sounds pretty good considering it's protected from environmental conditions, and maintains a constant temperature.
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