Dubai is a city of towering, architecturally brilliant skyscrapers, but since all were built only in the last several decades, the city’s central sewer system has not been able to keep up. Consequently, only a few are hooked up to the municipal system, and the remainder must hire fleets of tanker trucks to carry away the waste water. The trucks then must queue up, sometimes for 24 hours at a time, to dispose of it at treatment plants.