A legally mandated report that tracks the energy use of New York City's largest buildings provides details about which buildings are achieving higher-than-expected energy efficiency, such as the Chrysler and Empire State buildings, as well as those that are performing poorly. Unlike cities that depend heavily on automobiles, New York racks up most of its carbon dioxide emissions—nearly 80%—in heating and cooling buildings. Tracking this energy use is deemed crucial to meeting the city goal of cutting overall emissions by about a third by 2030.
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