Leo Marcelis of Al Jazeera on vertical farming

The world population and the number of people living in cities is growing. At the same time, the demand for healthy, fresh and locally produced food is increasing. Vertical farming has the potential to meet this demand: by growing in multi-layer systems that literally rise into the air, sustainable, efficient and fully controlled cultivation can be achieved in cities without taking up too much space. Professor Leo Marcelis explains to Al Jazeera the potential of vertical farming and what obstacles still need to be overcome.

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