You can do a lot with very little if you have realistic goals. Of course if the goal is to keep everything the same you're utterly fucked from the get go. It's

You can do a lot with very little if you have realistic goals. Of course if the goal is to keep everything the same you're utterly fucked from the get go. It's much easier to be sustainable in a small well built rectangular passive house than in the average texan mcmansion atrocity (bad insulation, insanely inefficient shapes, &c.) for example