Standing on the rooftop at St. Simon Stock Catholic School on East 182nd Street in the Bronx, New York, Daniel Simon, marketing director of the Gaia Institute, points to a neighboring high-rise apartment building. A couple is looking down from a high window over the rooftop garden. "Those people have been living here a long time," says Simon, "and one day they had a green roof to look at instead of city construction."
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