With rising temperatures, more frequent extreme weather events, and a host of effects on air quality, food supply, and infectious diseases, climate change is projected to have a major impact on human health and well-being. In many places, these effects are already being felt. In this part 2 of a 3-part series, Dr. Alistair Woodward, professor of epidemiology and biostatistics at the University of Auckland in New Zealand, provides more details on the chapter on human health in the Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment report.