The roof of the 12-story Chicago City Hall building has been retrofitted with a 22,000 square-foot rooftop garden to reduce urban air temperature. | Credit: Katrin Scholz-Barth
A Florida community focuses on energy efficiency to encourage economic growth.
A behind-the-scenes look at Helios Solar Works -- Milwaukee's first solar manufacturing facility.
After a decade of hard economic times, a rural Oregon community celebrates the opening of a new energy-efficient school.
Interactive map shows potential for rooftop solar in New York City.