Underground housing, underground businesses, etc. Would that be better for the environment + possibly save on energy costs? Also possibly safer in certain scenarios like tornadoes etc.
Potential issues that immediately come to mind are ventilation, earthquakes, and flooding. But it’s not like underground dwellings/basements/etc. aren’t a thing, so maybe those issues have been addressed in ways I’m not familiar with.
My graveyard-shift friend simply gets sunlight before going to work later.
It’s cold down there. Have you ever gone into a basement? That heat is useful.
Have you ever spent time in one with other people? My basement (furnished hangout space) warms up pretty quick when I have guests.