Today’s headlines can seem a grim litany of disasters, from hurricanes in the Atlantic and epidemics in South America to conflicts in Africa and droughts in the Midwest. For Dr. Alan Lockwood ’65, MD ’69, though, these calamities all have two things in common: they’re rooted in climate change, and they’re signs of public health crises that the medical profession—as well as other scientists, policymakers and citizens around the world—must address.