The NFL has been on a crusade for the past 14 years to reduce football's impact on the environment, and has quietly taken a lot of ecofriendly steps. Sunday's game between the Pittsburgh Steelers and the Arizona Cardinals will be powered by renewable energy and offset by tree planting. The venues will also recycle, donate leftover food to Tampa area food banks, and donate office supplies, decor, and construction materials to area nonprofits. So how do you celebrate a sustainable Super Bowl? Here are five ways.