In the US, approximately 8% of carbon emissions come from the health care system.¹ The 2021 United Nations Climate Change Conference called for countries to measure health care鈥搑elated carbon emissions and attain a net-zero emission state, in which carbon dioxide emissions are not greater than carbon dioxide reductions, by 2050.² The US Department of Health and Human Services called for health care organizations to decrease carbon emissions by 50% by 2030.³ However, these calls to action are likely to have a relatively small effect on the overall contributions of health care to climate change unless physicians, other health professionals, and health care organizations change their current practices.