The Manhattan of today, a narrow island no more than 12 blocks wide, brims with 1.6 million people who journey in cars, buses, and trains through valleys of steel, glass, and concrete.
For the visionary landscape designer Diana Balmori, green roofs are just scratching the surface. The real challenge is to rethink how our cities relate to their natural surroundings.
If you're planning to follow Werner Schmidt on his famous "dirty tour" of the United Nations headquarters, here's what I suggest: Bring your hazmat suit.