Clinicians and organizations in the health sector have healing missions, and physicians, specifically, take oaths to "do no harm." Yet, paradoxically, health care operations contribute to pollution and exacerbate environmental disease burden. This article offers a view of how health sector actions exacerbate climate warming and iatrogenically harm global public health and argues that clinicians and organizations have ethical responsibilities to respond.The American Medical Association designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 Credit™ available through the AMA Ed Hub TM . Physicians should claim only the credit commensurate with the extent of their participation in the activity.