Masdar City: A Quick Tour A few kilometers east of downtown Abu Dhabi, traditional Arab urban principles are informing high-tech construction at Masdar City, one of the world’s most complex experiments in urban sustainability. Planned a decade ago to replace every molecule of carbon energy it used with one or more new ones, Masdar City is adapting its aspirations to financial necessities while evolving into a leading laboratory at the congested intersection of energy, environment, economics and