New York Has 10 Olympic Pools' Worth of Green Roofs
From the Journal's breakdown of what a green roof is and how to get one: "The amount of green roofing in New York more than doubled to 123,074 square feet from 2004 to 2007, according to surveys by Green Roofs for Healthy Cities-North America Inc. That is an area roughly equal to about 10 Olympic-size swimming pools."

























Or, 123,000 square feet is a mere 2.82 acres.
Central Park is 843 acres and we've estimated at Columbia University that there may be up to 20 times Central Park's area of rooftop space in the New York City area, including all the boroughs.
So we've got a long way to go towards making productive use, via green roofs, of this currently wasted, indeed environmentally harmful (extreme urban heat and runoff sources), urban land surface area.
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