'green roofs'
from CNN online
"[...]Chicago was the U.S. leader, planting nearly 300,000 square feet (27,900 square meters) of green roof space last year.
Chicago Mayor Richard M. Daley has described green roofs as part of an effort to make his city "the most environmentally friendly" American city. Chicago, which installed a green roof on its City Hall in 2000, has offered developers more regulatory incentives than any other North American city, Peck said.[...]"
go Chitown
"[...]Chicago was the U.S. leader, planting nearly 300,000 square feet (27,900 square meters) of green roof space last year.
Chicago Mayor Richard M. Daley has described green roofs as part of an effort to make his city "the most environmentally friendly" American city. Chicago, which installed a green roof on its City Hall in 2000, has offered developers more regulatory incentives than any other North American city, Peck said.[...]"
go Chitown