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>> i tell people what is and isn't compostable. >> reporter: the campus is sao focused on the environment, that the school has topped the sierra club's cool schools ranking. football games are zero waste, everything is either recycled or composted. bicycles rule on campus, there's 10,000 of them. one for every three students. campus buses run on biodiesel, and the school chancellor tools around campus in an electric hybrid. >> this one, just since january has refilled 24,000 times, that's 24,000 16-ounce plastic water bottles that we are not sending to the landfill. >> how long has the environ...

College campus. students have even found a way to make money while saving the planet. we go to colorado, where "one simple thing" is making one big difference. >> reporter: at the university of colorado, boulder, even the trash has gone green. >> my name's kat, and i'm a compost goalie. i tell people what is and isn't compostable. and that's how you do it. >> reporter: the campus is so focused on the environment, the school has topped the sierra club's cool school's rating. football games are now zero waste. everything is either recycled or composted. bicycles rule on campus there. there's 10,...

Students at one university are not just preparing for exams, they're taking care of the environment. that's tonight's "one simple thing." here's jim spellman. >> reporter: at the university of colorado, boulder, even the trash has gone green. >> my name is kat, and i'm a compost goalie. i tell people what is and what isn't compostable. >> that's how you do it. >> reporter: the school has topped the sierra clubs cool schools ranking. football games are now zero waste, everything is either recycled or composted. bicycles rule on campus, there's 10,000 of them. one for every three students. campu...