[MalcolmTucker]

^ The article assumes that we will not be able to increase yields or decrease waste and spoilage. The material cost for these farms alone is crazy - a society that has to build them will be paying a lot more than we do now for food. Perhaps if we press every square inch of land into production, and press ever piece of land to maximum production it would make sense, but the world would have to be much more populated that any projection to make it worthwhile. It would be cheaper to irrigate distant unproductive deserts than to build these things.