The healthcare sector is a significant contributor to climate change, accounting for about 5% of global greenhouse gas emissions, comparable to the most polluting industries. Most emissions stem from the healthcare supply chain, including the production and disposal of medical devices and pharmaceuticals, rather than from hospital operations alone. Hospitals contribute around 30% of healthcare emissions in high-income countries, with surgical procedures having substantial carbon footprints. Wealthier nations disproportionately contribute to these emissions, while poorer countries, which emit less, face the harshest health impacts from climate change. To mitigate this issue, healthcare providers can adopt lower-emission treatment alternatives and improve operational efficiencies. Understanding the sources of emissions is essential for making impactful changes in healthcare practices, ultimately ensuring that hospitals can protect health without exacerbating environmental threats.