Hide Caption 1 of 12 Photos: The world's greenest grid Tower of power – A 45m-high wind tower in Masdar City takes inspiration from traditional Arab technology. Hide Caption 3 of 12 Photos: The world's greenest grid Car free – the city currently uses driverless pods known as "personal rapid transit" (PRT) carts. Hide Caption 6 of 12 Photos: The world's greenest grid Breathing space – Courtyards on campus provide relaxation space for students between classes. Hide Caption 10 of 12 Photos: The world's greenest grid Sculpted clay – The incubator building is a hub for start-ups and innovation. Building the sustainable cities of the future will be challenging, and we have a long way to go to close the urban financing gap.

Source: CNN December 01, 2016 17:36 UTC