Eliminating 199 million lb of hazardous chemicals and solvents, saving more than 21 billion gal of water, and avoiding 57 million lb of carbon dioxide emissions: Those are a few of the annual benefits derived from the technologies implemented by the past 82 winners of the Presidential Green Chemistry Challenge Awards. Now, five new winners of the presidential award and two of an affiliated student award were crowned during a ceremony held on June 20 in Washington, D.C.