Local Law No 97 of 2019, passed as a part of the Climate Mobilization Act by the New York City Council in March 2019, requires large (over 25,000 square feet in 2017) existing buildings in New York City reduce their emissions by 40% by 2030 and 80% by 2050. This law is unique and novel in its aim, because it targets existing buildings and requires owners to invest in renovation and retrofitting to make their buildings more energy efficient. Other similar laws have been passed worldwide, but target only new construction projects. The New York Post has called the law "one of the most ambitious climate legislations for buildings enacted by any city in the world."