City of Miami9. Manuel Diaz, Miami.
Though some critics have dubbed him “Concrete Manny” due to his love of development, Diaz is paving the way for sustainability in Miami. An early signatory to the U.S. Mayors Climate Protection Agreement, he created Miami’s first sustainability department and a community-wide Green Commission. He has pushed green building, led an energy-retrofit of City Hall that included solar-panel installation, and is converting the city’s fleet to more efficient vehicles. Late last year Diaz launched Bike Miami Days, and this spring the city hosted a week of events leading up to Earth Hour. “We’re on the front line of global climate change here,” Diaz told Newsweek in 2007. “The water level doesn’t have to rise too much for us to be riding around Miami in canoes.”