living space isn’t remotely a concern, if we all (the whole world) lived in a single mega-city as dense as NYC it would be about the size of Texas light also i

living space isn’t remotely a concern, if we all (the whole world) lived in a single mega-city as dense as NYC it would be about the size of Texas light also isn’t much of an issue, we could power the world with a solar array the size of New Mexico fertile farm land, stable temperature, and distribution are much much much larger issues living underground might be good for reducing electricity needs for heating and cooling, or avoiding certain natural disasters… but probably isn’t very useful for much else