When Dr. Jay Lemery gives presentations on climate and health, one of his slides has two pictures with an arrow between them: one with a polar bear and an iceberg, and another with a kid and an inhaler. “This is the transition we’re talking about,” he says. Lemery, a professor of emergency medicine at the University of Colorado School of Medicine and co-founder of the university’s Climate & Health Program, sees the growing trend of climate change impacting human health.