New York City has nearly 1 million buildings and nearly all of them (roughly 900,000) could be heated and cooled by the earth without burning any fossil fuels.
A recent report found that New York City was the most wasteful megacity in the world, and its buildings consume two-thirds of the energy we use. Over half of that energy is for space heating alone. Fossil fuels burnt for that purpose cause nearly 40 percent of CO2 emissions in America.
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