BusinessFounders Valley: Indonesia - future food07:30This browser does not support the video element.BusinessJoanna Gottschalk01/23/2018January 23, 2018Indonesia's urban population is exploding. As farmers leave the land, there are worries over the country's food security. German entrepreneur Fridtjof Detzner meets a start-up founder who has developed a vertical farming system for city dwellers.Copy linkAdvertisement