Super-tall buildings can be more energy-efficient than multiple shorter buildings with a combined equal floor space, says Adrian Smith, designer of the 3,280-foot-tall Kingdom Tower in Saudi Arabia. He explains that a super-tall structure has one floor and one roof, whereas several shorter structures would mean multiple roofs and ground floors, where energy load is added. More infrastructure and land would be needed as well. "It is pretty clear, when you think about it this way, that the energy efficiency of a super-tall building is superior to the equivalent number of low-rise buildings," says Smith.
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