The greening revolutionParis, the city of revolutions, of the Impressionists, the Worlds Fairs and the Olympics, of Haussmanns boulevards, of the Bois de Boulogne, the metro, and the Seine. Paris, also the densely built up city with so little greenery per inhabitant. Heat stress is a problem there like nowhere else. Under the influence of mayor Hidalgo, a green revolution is under way that is as rapid as it is exhilarating: roundabouts are turning into urban forests, the