The series moves to China, whose soaring population and rapid industrialization have created a boom in urbanization that is unprecedented in human history. In an attempt to tackle this global issue, the episode explores design solutions in both theory and practice, including Steven Holl’s Linked Hybrid Project, which when completed will be the largest residential, geothermal heating/cooling and greywater recycling system in the world. Also featured is architect, designer and winner of three U.S. Presidential Awards William McDonough. Recognized by Time magazine as “Hero of the Planet,” McDonough talks about his innovative plans to make China an entirely sustainable country and how it will demonstrate the ways architecture can be both profitable and environmentally intelligent.