http://www.confluence-denver.com/features/zerowaste_080713.aspx
In a sense, DIA is its own city, which guarantees one thing: lots of waste.
DIA is the only U.S. international airport that has designed and implemented an ISO 14001-Environment Management System (EMS) that encompasses the entire airport. DIA's EMS provides a framework for the airport to identify, prioritize and manage the environmental aspects of its operations. One key item on the agenda is to become a zero waste facility by 2020.