To build Masdar City, the provincial capital put in seed money for the estimated $20 billion cost. The project team, Masdar, a subsidiary of Mubadala Development Company, brought in the British architectural firm Foster + Partners, which boasts impeccable eco-credentials. The vision was for a 2.5-square-mile neighborhood that would be close to carbon neutral, thanks to clean-energy wizardry, LEED-certified building design, and a giant adjacent solar panel farm. – CityLab