Building "green" buildings is more than just a guideline for the U.S. Green Buildings Council; it's their primary goal and passion. With over 7500 member organizations, their number includes representatives from all sectors of the building industry who are dedicated to promoting buildings that are "environmentally responsible, profitable and healthy places to live and work." While some of their online materials are only for members, visitors will find plenty of valuable materials on the Leadership in Energy and Environmental Design (LEED) Rating system, which is recognized as the benchmark for the design, construction, and operation of high performance green buildings. Visitors to the LEED section of the site can learn more about the system and view presentations on the subject. Finally, the homepage contains news updates about their work and outreach efforts.