Air is not free any more in New York City—at least, not the air above your roof. In the scramble to find space within the limited confines of Manhattan, building owners are profiting by selling the empty airspace above their structures. Read on... PHOTO: Jessica Belasco The World Trump Tower rises 861 feet above New York streets.  PHOTO: Federico Genao Children play at Riverbank State Park, a rooftop park in Harlem.   Most visitors to Riverbank State Park never know they are standing on the roof of a wastewater treatment plant. Read on... With few green spots in New York City, there is little else beside concrete, brick and tar to absorb the heat of the summer sun. New Yorkers might not know urban heat island effect by name, but they know it by the steam that rises from the city's August streets long after the sun has set. Read on... PHOTO: Earth Pledge Cucumbers grow on a rooftop in the shadow of the Empire State Building.

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