Seven Supergreen U.S. Government Buildings

The U.S. government's clean energy research team now works on a campus in the Rocky Mountain foothills that aims to showcase the promise for better buildings. With Colorado's night air and intense sunlight helping to cool, heat and light the space for more than 800 workers, the new $64 million National Renewable Energy Laboratory (NREL) Research Support Facility uses half the energy of a more typical office building.

Pictures: Seven Supergreen U.S. Government Buildings