PHOENIX -- The NFL is planting thousands of trees in Arizona forests blackened by wildfires to help offset greenhouse gas emissions from the Super Bowl, to be played in Glendale Feb. 3.

The league also will power University of Phoenix Stadium and the adjacent NFL theme park with clean energy sources from New Mexico wind turbines to California geothermal plants.

The reforestation effort will offset the 350 tons of greenhouse gas produced by the NFL's 3,000-vehicle ground-transportation fleet. The league computed its carbon footprint with help from Princeton University researchers, the Environmental Protection Agency and the U.S. Forest Service.

But the carbon footprint calculations did not include air travel by NFL staff, teams and the thousands of fans who will fly or drive into the Phoenix area during Super Bowl week.