This chapter will help you understand the relationships between health, health care, sustainability, climate change, and carbon reduction, locally and globally. The specific objectives of the chapter are to help you make the case for action by showing how health, health care, sustainable development, and climate change are linked positively such that what is good for mitigating climate change is also good for health and health care today, translate science into policy and practice and help move research and action about climate science into policy and practice, and engage a wide range of stakeholders and appreciate that, as in much public health practice, appropriate action comes from involving a diverse group of people through genuine engagement.