The NYT is reporting that the U.S. Conference of Mayors is supporting a mandatory "green" construction code designed to reduce the impact of commercial buildings on the environment. The article goes on to note: "A handful of states and cities already require new public buildings to meet sustainable design benchmarks, such as the U.S. Green Building Council's LEED (Leadership in Energy and Environmental Design). Meeting such environmental benchmarks is voluntary for the vast majority of private buildings, however."