[lynx97]

The person I replied to wrote about indoor gardening. So sustainability was always out of the question. Besides, you dont have to go back to preindustrial times. My parents had enough "land" to grow food for us. It basically ended around 1985 when they finally realized it was far easier to just buy stuff at the supermarket, because, as you already mentioned, growing your own food is very time consuming. Around that time, almost everyone I know stopped to try to be self-sustaining.