Agriculture in the city.
Be it rooftop gardens or highly efficient hydroponics, urban farming makes cities a little "greener" - and helps feed their residents.
Essen, in the heartland of Germany's Ruhr area, was once the country's industrial hub. But since the decline of coal mining, the entire region has been working to reinvent itself as a center of culture and environmental activity. Its efforts are paying off: Essen has been designated European Green Capital 2017.
Around the world more and more people are leaving the countryside for opportunities in the city, creating a market gap that is increasingly being filled by urban farmers. One family draws on each member's talents to create a successful agribusiness.