content: I agree, personally I see self-sufficient cities as an utopia in the long run, they are a huge drain on natural resources (not just food). Being self-sufficient in a varied food production involves space, not that much (about 1/2 acre for a family of 4 vegetarians) but way more than the density of a city allows. What we'll need eventually is a large web of spread out interconnected little towns. I like the low-tech approach to their design though.