Post office employees work on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau