The U.S. green building market is accelerating at a dramatic rate, says McGraw-Hill Construction's Green Outlook 2009: Trends Driving Change report, released at the Greenbuild International Conference and Expo in Boston, MA. The value of green building construction starts was up five-fold from 2005 to 2008 (from $10 billion to $36-$49 billion), and could triple by 2013, reaching $96-$140 billion.