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Earlier this summer , journalists on the Climate desk at The New York Times heard a curious rumor: Phoenix was turning into a city of vampires.

It began when Hannah Fairfield, the Climate editor, got wind that outdoor workers in Phoenix had begun working at dawn and dusk in summer months to avoid the sweltering heat. That gave rise to a photo-driven project about the city, which documents the ways climate change has caused Phoenix’s days to creep earlier into the morning and later at night, away from high sunshine. “It’s so hot during the day that everyone has to come out and conduct their lives and their business at night,” said Matt McCann, a photo editor at The Times who works with the Climate desk.

The photographer George Etheredge spent nearly a week covering this way of life with Marguerite Holloway, the reporter. Before leaving New York, Ms. Holloway spent weeks calling businesses and investigating summer lifestyle shifts that would offer Mr. Etheredge something compelling to photograph when they arrived in Phoenix in early July.