Read the full story in the New York Times.
Sports arenas and stadiums have a far smaller carbon footprint than many factories, shopping malls and office buildings. While they host thousands of people on game days and for big events like concerts, in general they are used intermittently and for short bursts.
But in recent years, they have become showcases for green design, even as critics say leagues are wrapping themselves in eco-friendly banners to help market their sports. Still, team owners and building operators have learned that environmentally friendly arenas and stadiums are cheaper to operate, and nothing talks louder than money.