Some of the most densely populated cities across the globe are tackling population growth and food shortages by establishing more rooftop farms. Vertical farms are popping up on unused rooftops in cities across the globe and the outcome is extremely positive. — DesignBuild Source

Singapore now has its first commercial vertical farm, which means more local options for vegetables.

The technique uses aluminium towers that are as tall as nine metres, and vegetables are grown in troughs at multiple levels.

The technique utilises space better -- an advantage for land-scarce Singapore. — channelnewsasia.com

Architects are tackling the problems of the concrete jungle with ambitious schemes using green technology to grow forests in the sky — ft.com

Agricultural researchers believe that building indoor farms in the middle of cities could help solve the world's hunger problem. Experts say that vertical farming could feed up to 10 billion people and make agriculture independent of the weather and the need for land. There's only one snag: The urban farms need huge amounts of energy. — spiegel.de