Underground houses were trendy back in the 1980s. Also in the 1880s. My grandparents lived in one back in the '30s; of course, they called it a dugout, not an underground house.This may sound absurd to some of y'all, but the best way forward would be to build our houses underground. Natural insulation! Solatubes could provide most of the light during the day. Could have a small bank of solar collectors and an individual windmill for each residence.