Vertical Farming

Read an article on Vertical Farming on 'The Economist'. As people are migrating to the cities in huge numbers farm lands are getting converted to rela estates and farmers are not enjoying the benefits of the so called white collar jobs, farm output is diminishing. To bridge this gap, farming should happen where people dwell on the most..the answer is cities. In multilevel or vertical farming, green house gases are used in a controlled environment. Water with minerals is used to irrigate the floor. The challenge is sunlight availability to the plants in all storeys. Hence a scientist proposed, a rotating storeys. So that sunlight is available evenly. Though vertical farming sound practical, it is efficiency needs some more evidences!!