The United Nations has undergone a sweeping green initiative to increase its energy efficiency. When it came time to renovate the U.N. Headquarters in New York City, they partnered with Skanska, an international construction and consulting firm and leader in green building practices. The building's original, 60-year old windows had to be replaced in the project, and instead of sending them off to the landfill, we were brought on to recover the glass. We worked with Urban Mining Northeast, LLC to turn the glass into Pozzotive, a Supplementary Cementitious Material (SCM). That was used to replace 20% of the Portland cement used in the Unilock Ecoloc permeable pavers that were installed at the foot of the U.N. complex.