Two thousand four has been a remarkable year for the green-building movement. The past year has witnessed the birth of three new entities in the U.S Green Building Council's Leadership in Energy and Environmental Design program. In addition to LEED for New Construction (NC), which has been in place for four years, 2004 has seen the launch of LEED for Existing Buildings (EB) and Commercial Interiors (CI), with yet a fourth program, LEED for Core & Shell (CS), well into the pilot phase. The successful development of these complex green-rating systems is a tribute to the hard work of their respective committees and the USGBC leadership.
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