For the past 18 years, the NFL has been working to decrease the environmental footprint of the largest annual sporting event in the U.S. — the Super Bowl. Two years ago, we wrote about several initiatives aimed at reducing the events’ impacts. Last year, we covered how Super Bowl XLV was slated to be the greenest NFL championship game in history. This year, the NFL is trying to outdo itself yet again by working with the Green Mountain Energy Company and the Indianapolis community to make Super Bowl XLVI the greenest yet. I talked with Jack Groh, Director of the NFL’s Environmental Program, to get the details on this year’s efforts.