For the first time since 2011, Colorado took the top spot on the list, which ranks states based on the number of LEED-certified square feet per person. LEED is among the most widely used green building rating systems in the world with more than 100,000 projects engaged. This year’s top states are home to more than 105 million people, including more than 80,000 LEED green building professionals with the skills to support the sustainable transformation of buildings.”