In a few short weeks, approximately 30,000 people from all over the world will descend upon the historic city of Philadelphia for the Greenbuild International Conference & Expo, which features three days of extensive educational programming, workshops and showcases of the latest green products and services.

U.S. Green Building Council's (USGBC) Greenbuild International Conference & Expo, the world's largest conference dedicated to green building kicked off today at San Francisco's LEED Gold Moscone Center with 7,000 attendees.