Globally, buildings are responsible for 8% of greenhouse-gas emissions. In New York City alone, buildings account for 75% of GGEs. In response, mayors and other concerned groups are focusing on making buildings and cities better citizens in regard to climate mitigation. Existing buildings are a big target. On the global stage, C40 Cities-a collective of 58 large cities that was created in 2005-advances and shares programs and regulations in partnership with former President Bill Clinton's Climate Initiative. "Cities are acting because mayors face the results of climate change," said David Miller, former chairman of C40 and a former mayor of Toronto, at a Feb.
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