The National Playground Safety Institute Known as the most comprehensive training program on public playground safety, NRPA's National Playground Safety Institute offers hours of training by nationally certified playground safety experts, and prepares  and certifies professionals through Certified Playground Safety Inspector (CPSI) courses and exams. U.S Green Building Council The U.S. Green Building Council (USGBC) is a non-profit organization committed to expanding sustainable building practices. Their mission is to transform the way buildings and communities are designed, built and operated, enabling an environmentally and socially responsible, healthy, and prosperous environment that improves the quality of life.