NFL Commissioner Roger Goodell stands near a marker that recognizes Soldier Field as the only NFL stadium to become a LEED-certified green building during a news conference Thursday, May 31 2012, in ... more 
NFL Commissioner Roger Goodell stands near a marker that recognizes Soldier Field as the only NFL stadium to become a LEED-certified green building during a news conference Thursday, May 31 2012, in Chicago. (AP Photo/Charles Rex Arbogast) less 
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Associated Press | Photo By Charles Rex Arbogast
Thu, May 31, 2012 3:37 PM EDT