A vertical farm is a building designed for growing food in cities. Though none has yet been built, architects from around the world continue brainstorming.
Four architects comment on their futuristic designs for vertical farms of the future in this video.
The skyscraper farming idea doesn't require any chemicals and was specifically designed to be used in limited space. Whether or not it will be feasible as an investment remains to be seen.
Naturally, the designs that don't rely on cheap energy will be the ones to bet on.