A vertical ¨green house¨ in Sweden is under construction

The future of urban farming is under construction in Sweden as agricultural design firm Plantagon works to bring a 12-year-old vision to life: The city of Linköping will soon be home to a 17-story "vertical greenhouse." The greenhouse will serve as a regenerating food bank, tackling urban sprawl while making the city self-sufficient. Plantagon predicts that growing these plants in the city will make food production less costly both for the environment and for consumers, a key shift as the world's population grows increasingly urban—80 percent of the world's residents will live in cities by 2050, the United Nations estimates. "Essentially, as urban sprawl and lack of land will demand solutions for how to grow industrial volumes in the middle of the city, solutions on this problem have to focus on high yield per ground area used, lack of water, energy, and air to house carbon dioxide," Plantagon CEO Hans Hassle says. The greenhouse is a conical glass building that uses an internal "transportation helix" to carry potted vegetables around on conveyors. As plants travel around the helix, they rotate for maximum sun exposure. Hassle says the building will use less energy than a traditional greenhouse, take advantage of "spillage heat" energy companies cannot sell, digest waste to produce biogas and plant fertilizers, and decrease carbon dioxide emissions while eliminating the environmental costs of long-distance transportation. And growing plants in a controlled environment will decrease the amount of water, energy, and pesticides needed. The greenhouse, which will open in late 2013, is already serving as a model for other cities—Plantagon hopes to install the transportation helix technology in regular office buildings around the world, eliminating the need to build entirely new structures. The tallest models even have a name: Plantascrapers.

REFERENCE:

http://www.good.is/post/a-vertical-greenhouse-could-make-a-swedish-city-self-sufficient

Most interesting for me is the response from agronomist Miguel Aloysio Sattler, I really appreciate his point of view:

Dear Myriam,

That is complete nonsense. The traditional food production systems would require an area something between 4 and 10 times larger than the share of urban space/per capita to supply a minimum diet. So you can guess how much built area you would need to grow all this food on a building. As an agronomist I have been investigating this for several years with my students and the exact area would depend on the type of diet of each person. You could minimize this required area by using intensive production systems, like the permacultural forest garden we have talked about some weeks ago.