A woman walks onto the deck of a home designed by students of the University of Calgary for the Solar Decathlon in Washington

 
A woman walks onto the deck of a home designed by students of the University of Calgary for the Solar Decathlon in Washington
A woman walks onto the deck of a home designed by students of the University of Calgary for the Solar Decathlon in Washington September 26, 2011. The U.S. Department of Energy Solar Decathlon is a competition that challenges collegiate teams to design, build, and operate solar-powered houses that are cost-effective, energy-efficient, and attractive. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS EDUCATION ENERGY ENVIRONMENT SOCIETY BUSINESS)