Stadium owners dragging their heels on finding greener ways to power up their high-definition scoreboards and retractable roofs just got a kick in the pants from their league commissioners.

Major League Baseball, the National Football League, the National Basketball Association, the National Hockey League, and Major League Soccer have dished out letters to their teams and facilities asking them to embrace solar power.

http://blogs.reuters.com/mediafile/2010/09/15/sports-stadiums-going-green/