1 From the Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, and the Center for Climate, Health, and the Global Environment, Harvard T.H. Chan School of Public Health, Boston (R.N.S.); the Department of Emergency Medicine, School of Medicine, the Department of Environmental and Occupational Health Sciences, School of Public Health, and the Department of Global Health, Schools of Medicine and Public Health, University of Washington, Seattle (J.H.).