Links[1] https://usea.org/publication/barry-worthington-address-4th-european-energy-forum-march-2015 [2] https://usea.org/sites/default/files/Worthington_abstract_US%20Private%20Sector%20Perspectives%20Post%20Kyoto_05-2015_France.pdf [3] https://usea.org/energy-category/energy-efficiency