Textbook in PDF format Distinctively, this book brings together an end-to-end understanding of heatwaves, that is, a consideration of their causes, consequences for human and natural systems and societal responses to them in the form of adaptation and mitigation actions. It advocates for recognizing "the heatwave imperative" and emphasizes that “heatwaves matter”. Together, the individual chapters make the point that “knowing heatwaves” from a holistic interdisciplinary perspective will assist with efforts towards heatwave risk reduction and building resilience to what is probably the most pervasive of a range of climate hazards