The U.S. Green Building Council (USGBC) released its annual ranking of U.S. states leading the way on green building with Massachusetts topping the list. The USGBC ranking is based on LEED-certified gross square footage per capita over the past year. The LEED rating system is among the world’s most widely used green building programs and was created by USGBC as a leadership standard defining best practices for healthy, high-performing green buildings.