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俄勒冈州和华盛顿州排名前三的统计es when it comes to USGBC LEED certification, an indication of the region’s dedication to the environment. LEED certification has long been held as a symbol of a building’s commitment to sustainability, not to mention a means of satisfying local regulations requiring compliance, such as Seattle’s Sustainable Building Policy enacted in 2000. Photo: Optimum Energy The property managers for Aventine, a business complex in La Jolla, Calif., used ENERGY STAR to assess energy usage, revealing that upgrades to the HVAC system would result in significant energy savings with minimal investment. +Image Upgrading