Post office workers grow vegetables, breed chickens on Paris rooftop 'farm'

Post office employees pose 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

PARIS (Reuters) - An urban agriculture initiative to make Paris more environmentally sustainable, mainly through farming on the capital's rooftops, has been such a success that the mayor is unveiling a new round of projects this week.

Rooftop farming has boomed in the past years from New York to Tokyo via London and Paris.