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In this Monday, July 23, 2018 photo, heat ripples blur the downtown skyline as a jet lands in Phoenix, Ariz., as temperatures exceed 100 degrees in the morning hours. Already devilishly hot for being in the Sonoran desert, Arizona’s largest city is also an “urban heat island”, a phenomenon that pushes up temperatures in areas covered in heat-retaining asphalt and concrete. Phoenix officials say they are tackling urban warming, monitoring downtown temperatures, planting thousands of trees and capturing rainwater to cool off public spaces. (Photo by Matt York/AP Photo)
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