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New York City is taking drastic action to reduce greenhouse gas emissions by the city’s biggest polluters, and the culprits are “not” cars. City officials passed a landmark package of bills to reduce the city’s carbon footprint, and the centerpiece is a mandate for older, glass and steel skyscrapers. They are considered “incredibly inefficient” because so much of the heating and cooling escapes through the glass. This new law aims to change that with rigid new guidelines and retrofit requirements.