AZCentral.com

The tens of thousands of people who will descend on Arizona in February for the Super Bowl will leave a carbon footprint on the road and in the skies, along with tons of trash, but the National Football League will endeavor to soften the blow.

The nation's most popular sporting event brings with it an environmental agenda, from planting trees and investing in renewable energy to sowing seeds of sustainable thinking among football fans.

"It's not so much about how much of the problem do you create; it's about how much of the problem are you willing to take responsibility for," said Jack Groh, director of the NFL Environmental Program.

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