CLIMATE: Mayors join forces to improve building efficiency in cities Jean Chemnick, E&E reporter Published: Wednesday, January 29, 2014 Big-city mayors today launched an initiative aimed at boosting the energy efficiency of urban buildings in 10 U.S. cities. Please subscribe to E&ENews PM to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.