More than two hours before the 9 a.m. opening session for Greenbuild was set to begin in Chicago's McCormick Place conference center, that largest of U.S. convention centers (in square footage) was already bursting at the seams. If you were looking to register for the conference, the line might be negotiated by lunchtime. If coffee tempted, the line at the in-house Starbucks snaked all the way into a sky bridge around the corner from the store.
