It was built inside an old, 25,000-square-foot semiconductor factory and uses 100 times less water than an outdoor farm. What's more, they claim that their produce contains 8 to 10 times more beta-carotene and twice the vitamin C, calcium and magnesium as its outdoor-grown counterparts.

The produce grown at this weather-resistant, climate controlled plant uses LED lights and can yield over 10,000 heads of lettuce per day! With examples like this it is easy to see why indoor gardening or urban green-housing is expected to grow from a $30 million to a $270 million industry by 2020. With solar power, the cost to produce organic, non-GMO foods could be lowered even more. This trend is also likely part of a new high-tech, non-GMO, organic farming model that is more sustainable, and can ensure food sustainability in even the most climate-challenged locales.

Another Japanese farm is located in the basement of a high-rise building in Tokyo. It uses hydroponics to grow a variety of flowers all year long.

The Japanese government plans to promote indoor gardening as a way to create jobs and aid in food security. Officials will offer incentives including low-interest financing and a capital investment tax credit. About 40 indoor growing facilities are already in operation nationwide.