The book begins by exploring how climate change is affecting human health through the increasing frequency of natural disasters, such as bush fires, droughts and heatwaves, and the emergence of new infectious diseases, such as the SARS-CoV2 virus, all of which drive up demand for health services that are already heavily burdened by increasing rates of chronic diseases and ageing populations. Chapters then turn to the contribution of the healthcare system itself to climate change - explaining how current clinical practices, including wasteful care of low value, create an unsustainable carbon footprint and threaten the very viability of healthcare systems.