NYC City Council Bill Aims To Reduce Energy Usage By Limiting Lighting Of Empty Buildings At Night

NEW YORK, NY - MAY 05: People congregate on the top of Rockefeller Center's viewing deck "Top of the Rock" to view the Manhattan skyline on May 5, 2015 in New York City. In an effort to reduce Manhattan's carbon footprint, New York's City Council is considering a bill that would limit the amount of external light commercial buildings may use when empty at night. If approved, the bill could alter the use of lights in nearly 40,000 structures and potentially change the iconic nighttime view of Manhattan. The controversial bill has received support from Mayor Bill de Blasio. (Photo by Spencer Platt/Getty Images)