Vertical farming is a 21st century way of maximizing agricultural output in a small space. It uses cutting-edge technology like aeroponic towers as as-needed watering systems. That lets people grow food for their own use and for sale in much smaller "farms | Interesting Engineering

A farm inside a skyscraper? These indoor vertical farms use 95% less water than field farms, and they could be the key to feeding a growing world population. | Opposing Views

This vertical indoor farm can grow millions of crops without the need for any soil, sunshine or fertilizer. | Mashable