So much is happening so fast in China, and with Beijing tapped to host the 2008 Summer Olympics, air quality is a specific current concern. But since the city’s downtown area is already too crowded to add more ‘green belts,’ or urban areas set aside for planting trees and shrubs, officials are looking upward to achieve their goals.

Rooftop green belts, could potentially be seen on 30 percent of the city’s high rises and 60 percent of its lower buildings by the time the games come around…

Ten thousand square meters of rooftop lawns were planted in 2004 and the government plans to up that number to 100,000 square meters this year. The vegetation of choice is evergreen grass, which proves resilient against and Beijing’s high temperatures and typic dry weather.
(Via Treehugger)