The Sept. issue of Fast Company had an article that featured the Philadelphia Eagles. "Growing the green team," by Luke O'Brien starts with this paragraph:
Sports in America will always be an indulgent birthright. You don't go to the ball game to worry about whether the world will melt. You go to escape. You go to eat a hot dog and drink a beer and possibly (or probably) curse at someone on (or off) the field--especially if you're in Philadelphia, where spectating is its own contact sport. But here's what else Eagles fans can expect at Lincoln Financial Field: scoreboards powered by solar panels; cooking fat from the kitchens recycled into biodiesel; 80 wind turbines on their way.