In the mid-2000s, Dr. Jay Lemery became alarmed by the growing conflict between politicians and scientists over climate change. When he started looking into how doctors were reacting to the developing crisis, he was even more dismayed to discover that few health care professionals were wise to the health stressors of a warming world. So Lemery, now a wilderness and emergency medicine physician at the University of Colorado Anschutz Medical Campus, took up the cause himself. “My jam became to mobilize the clinical community,” he says, “both as advocates but also as practitioners of health.”