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Late in 2011, the total footprint of commercial projects certified under the U.S. Green Building Council’s (USGBC) LEED Green Building Rating System surpassed one billion square feet. Another six billion square feet of projects are registered and currently working toward LEED certification around the world. Since it was first introduced to the marketplace in 2000, over 36,000 commercial projects and 38,000 single-family homes have participated in LEED.