SAN FRANCISCO – One of the core pillars of Pac-12 Team Green, the Conference today announced that the University of Colorado Boulder has been selected as the overall winner of the "Pac-12 Zero Waste Challenge" for the 2018 football season. Also recognized as subcategory winners included the University of Arizona (most-improved), Arizona State University (best student-athlete engagement) and the University of Washington (best fan engagement). All four institutions will be recognized and honored during a special ceremony during the 2019 Pac-12 Sustainability Conference set for June 25-26 at the University of Washington.