Most fans wouldn’t notice it, but Super Bowl XLV was played in green stadium. The U.S. National Football League’s newest and largest stadium, Cowboys Stadium in Arlington, Texas, showcases a growing trend in sports toward greener arena designs and cleaner energy.

Sports stadiums around the world are making energy-saving improvements by installing solar panels, adding wind turbines, efficient lighting, increasing recycling, and improving water management systems.

For more information, read Kickoff Time for Green Stadiums on National Geographic News.

Photograph by Photograph by David Drapkin, AP