This story was produced by Grist and co-published with Arizona Luminaria . This story is part of Vital Signs, a Grist series exploring the ways climate change affects your health. It is published with support from the Wellcome Trust.

John Galgiani has been waiting for this call.

The 79-year-old physician is sitting on a chair in a side office at a health clinic in Phoenix, Arizona, long legs crammed under the table in front of him, hands folded at his stomach, when his cell phone rings. “There’s my guy,” he says.

The man on the other end, a physician who works in Tucson, is a touch less relaxed. One of his patients has been in and out of the hospital with a respiratory infection so severe that at one point she coughed up blood. Her skin is flaking, she’s losing her hair, and now the v

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