Think of the Super Bowl and you think of excess: Big money, big parties, big crowds and an even bigger mess left behind when the circus leaves town.
Well, at least the messy part is getting smaller. Beginning in the 1990s, the National Football League has sought to gradually reduce the footprint left behind by the Big Game, and the league is taking steps to make the Feb. 2 Super Bowl at MetLife Stadium the most environmentally friendly yet, from planting trees to offset carbon emissions to composting food waste to using biodiesel to power generators.