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Even with all those twinkling lights that are on, the city's per capita greenhouse emissions are a third of the rest of the country. If NYC was a state, it would rank 51st in per capita energy consumption. The reason is twofold; much smaller living spaces and, the most obvious one, no cars. The article also states that the city intends to lower greenhouse emissions by a third in the next twenty years.
Despite the city's green ranking and real greenness with so many parks, there is still one little problem regarding the future--the city is at sea level. As glaciers melt and oceans rise, Manhattan is likely to find itself battling the ocean more than the sun. And suddenly, those 6 floor walk-ups will have a lot more value.