Rooftop gardens lower temperatures and filter the air that passes over them which helps to reduce air pollution. Green roofs last twice as long as conventional roofs and may be used to grow useful vegetables, herbs, and flowers.
According to the Green Roofs for Healthy Cities, "Green roof technologies not only provide the owners of buildings with a proven return on investment, but also represent opportunities for significant social, economic and environmental benefits, particularly in cities."
Find out more about green roof technologies at their website:
Sounds radical? According to the Winter 2006 issue of Herb Quarterly, in Chicago even Target, Walmart, and McDonald's have green roofs.