Quote Originally Posted by Emperor Ing View Post
I see, but I think the real biggest problem is that our current level of technology wouldn't let such a thing be cost-effective. Think about it: You need the electricity to power what amounts to hundreds of sun-lamps, and that's in addition to the costs of building/maintaining a skyscraper which alone would be prohibitively expensive.
Did you see the disclaimer at the end of that post? I may not even have been talking about 3D farming. I know that the farm-in-a-skyscraper is on the table somewhere though, I remember reading an article on it.

It may have been geared toward getting local production of food into major cities where the nearest airable land was otherwise far enough away to require delivery via major transportation firms.