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The skyscraper Burj Khalifa as seen through a dust storm on March 20, 2017 in Dubai, United Arab Emirates. (Li Zhen/Xinhua/Sipa USA/TNS)

The skyscraper Burj Khalifa as seen through a dust storm on March 20, 2017 in Dubai, United Arab Emirates. (Li Zhen/Xinhua/Sipa USA/TNS)