Climate change intensifies environmental hazards, such as cyclones, droughts and floods, which affect the health of millions of people each year. This Atlas, jointly produced by the World Health Organization (WHO) and the World Meteorological Organization (WMO), gives practical examples of how the use of weather and climate information can help protect public health through prevention, preparedness and risk management. It also stresses that other types of vulnerability influence the relationship between climate and health, including environmental degradation, poverty and poor sanitation. Numerous maps, tables and graphs assembled in the Atlas make the links between health and climate more explicit. The presented case studies illustrate how collaboration between meteorological, emergency and health services is already saving lives. For example, the death toll from cyclones of similar intensity in Bangladesh reduced significantly due to improved early warning systems and preparedness.