Stefano Boeri Architetti is bringing the vertical forest concept popularized in Milan to Nanjing, China with the Nanjing Towers. The two green towers could provide the city with a breath of fresh air, producing around 132 pounds of oxygen every day as they absorb carbon dioxide. They’ll accomplish this air-cleaning feat with 1,100 flourishing trees from 23 local species and 2,500 cascading shrubs and plants.

http://inhabitat.com/chinas-first-vertical-forest-is-rising-in-nanjing/