Chicago's mayor Richard Daley is looking ahead to the future, and for him, the future is sustainabilty and urban agriculture. In a place like Chicago, where there might not be an abundance of open, green space, he's looking upwards... to rooftops!
Rooftop gardening is a way to conserve energy and, of course, add to the beauty of a conventional building. Not only is he promoting this gardening practice, but he's put out a 16-page booklet free, on the internet, and available to the public.
Let's hope that other politicians are leaning in this direction! And even if they aren't, this information is now open and available to the general public. The spread of knowledge is powerful!