Never before have so many skyscrapers been planned or under construction all over the world at once. Now a new generation of ultra-modern skyscrapers has been designed to help revive city centers, spare the climate and check urban sprawl. Building "green” has now become an economic necessity, most especially in Asia’s burgeoning megalopolises. The key question here is whether it is possible to build a high-rise that is both green and efficient. The first certified sustainable office high-rise is currently going up in Panama City. From Vertical Farming in New York City to the "Garden City” of Singapore, environmental skyscrapers are swiftly becoming one of today’s key technologies.