This is extremely unsustainable lifestyle, both economically as well as environmentally.
This comes from reports for a compulsory subject called Environmental Design, which is packaged as a way to think about sustainable building and sustainable lifestyle, but is really nothing more than a way to 'greenwash' future generations of architects. Pass through our Brand New Course and come out Sustainability Friendly!
ps this is a 'non-humane' or politically correct solution to the problem, but the only way i can see humans becoming "sustainable" is if we get rid of the taboo which makes it wrong to farm other human beings for food / skins / etc. all solutions right now are extremely humancentric, but it is a fact that we are a problem in our huge numbers. perhaps it is a solution to stop having children and allow our species to die out to a reasonable and supportable level.