"In Hong Kong, Rich Live In Mountain Mansions And Poor Live In Cages" http://www.businessinsider.com/hong-kong-rich-live-in-mansio... I think it wouldn't be too far out to guess that the eventual end of planet earth is to be covered with structures like in the article posted and people living in it along the lines of the one linked here. How many people could you cram in like that? Hope you like to eat fish.
Secondly, We be living off soylent