July 7, 2014, 10am PDT
Philadelphia's Mayor Michael Nutter has set a policy goal of becoming the "Greenest City in America," but the city's lack of progress in reducing automobile use is a troubling obstacle to such a lofty goal.
January 24, 2011, 6am PST
This TIME video is titled, "What Makes Cities Smart?" But the mayors interviewed - Villariagosa, Daley, Nutter - are mostly obsessed with building public transit and high-speed rail.