content: You're correct that the constraint is not really available land, at least not in the U.S. Japan or other small countries might benefit a lot from this, but that's actually beside the point. Concentrating the growing area and minimizing soil use means far less pesticides, far more efficient irrigation, less harvesting labor, and basically greener healthier food. Those are all net positives that could outweigh the cost of the structure in the long run. I totally agree with the article that this isn't going to feed any of the places that are starving -- starvation, as the article observes, is a human-created condition that has nothing to do with food production. Dismissing the technology as useless because it doesn't solve one particular problem is a bit short-sighted.