The company hoping to build the world's tallest skyscraper in record time held a groundbreaking ceremony on July 20, in Changsha, China. Broad Sustainable Building is planning to build the 838-meter Sky City using its prefabricated modular constructi...

As soon as 2014, the Burj Khalifa may no longer be the tallest building in the world. Sky City, a planned 220-story prefab tower in Changsha, China, will soon claim that title. According to Lloyd Alter at Treehugger, Broad Sustainable Building, the c...