Given the legalization of recreational marijuana in Washington and Colorado, this year’s Super Bowl featuring the Seattle Seahawks and Denver Broncos has already earned a few chuckles as the “green” bowl. Pot jokes aside, the annual pigskin revelry has become progressively more environmentally friendly over the past 20 years, according to the National Football League.

“Every year we are trying to push harder to make this a greener event,” Jack Groh, who has directed the league’s environmental program since Super Bowl XXVIII in Atlanta, told NBC News. Whether Super Bowl XLVIII will be the most environmentally friendly yet is hard to say, he noted, but boasted that it will be “the greenest sports event that New York and New Jersey have ever hosted.”