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The GSA concluded that the U.S. Green Building Council’s (USGBC) LEED green building rating system can and should be used in government buildings to advance energy efficiency and to save taxpayers’ money. GSA issued its recommendation based on the findings of the EISA §436(h) Ad-Hoc Review Group on Green Building Certification Systems. More than 1.5 million square feet of space is certified using LEED every day, making LEED the most widely used high-performance building program for the design, construction, maintenance and operations of green buildings. More than 55,000 projects are currently participating in the commercial and institutional LEED rating systems, comprising 10.4 billion square feet of construction space in more than 140 countries and territories.