Planetary health is a field focused on characterizing the linkages between human-caused disruptions of Earth's natural systems and the resulting impacts on public health. As physicians, nurses, and other clinicians are on the frontlines of protecting health, it is important that they recognize the interlinkages between environmental change and emerging health impacts. And while global environmental challenges pose enormous risks for our health and wellbeing, they also provide opportunity for action. We need to prepare and respond to new health threats, address the root causes stemming from demographic shifts and our patterns of production and consumption, and make changes in both our institutional structures and our everyday lives. Clinicians are consistently ranked as some of the most trusted sources of information, and they have a unique capacity to understand and communicate the shifting landscape of planetary health challenges and the strategies that individuals can take to simultaneously safeguard their health and that of the environment.