The level of ecosystem integrity necessary for life on the planet is under threat, and the changes indicate the proximity of irreversible tipping points. Planetary crises such as climate change, biodiversity loss and pollution are affecting human health and threatening previous gains in global health. These crises are not future risks, but current events. Health workers must be prepared to provide care in a system that is not ready for a climate-changed world. They must be educated about the nature of threats, causes of crises, methods of identifying and preventing new health impacts, and strategies for advocating for mitigation. Patients, families and communities must be prepared to adapt to change. The article calls on health educators to move curriculum content beyond climate change into the full range of planetary health. They should move from interprofessional education to transdisciplinary education and systems thinking.