Green Roof
Officials at Tyndall Air Force Base, Fla., opened a new fitness center Aug. 20, 2010, that is expected to reach the U.S. Green Building Council's Leadership in Energy and Environmental Design Platinum level thanks to energy savings and environmentally friendly technologies, including these solar panels, or photovoltaics. The building also features cool-roof technology and a solar-generated hot-water system which are expected to help achieve a 9-percent energy savings for the building. (U.S. Air Force photo/Jonathan Green)