Paul Shepard once took a very different tack, proposing, somewhat playfully, that in the United States the entire population be moved to the Atlantic and Pacific coasts, housed in arcologies, and fed by high tech means from algae. (religion-online.org)
Obviously the economic system that would fit in with arcologies and the primacy of farming would be quite different from the one that has dominated most of the world in recent times. (religion-online.org)
However, the goal in an ecological civilization would be to make arcologies together with the nearby countryside as self - sufficient as is practical. (religion-online.org)