Buildings take bloom with living walls, roofs - Des Moines Register

The Des Moines Public Library was built in 2006 with a tub-like green roof designed to retain up to 187,500 gallons of rainwater. The city of Chicago, which ...

Source: http://www.desmoinesregister.com/article/20110423/LIFE/104230303/0/FRONTPAGE/?odyssey=nav|head

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