An estimated 40,000 participants, including those from the architecture, engineering, and construction industry, are expected to gather for this year's 12th annual Greenbuild Expo in Philadelphia. The world's largest conference dedicated to sustainable building will be focusing on several topics such as LEED, net-zero energy and life cycle assessment. "We have really kind of changed the game in terms of sustainability in the built environment," said Jacob Kriss, spokesman of the U.S. Green Building Council, the conference's host.

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