What does it take for a volcanic eruption to really shake the world? Did volcanic eruptions extinguish the dinosaurs or help humans to evolve only to decimate their populations with a super-eruption 73 000 years ago? Did they contribute to the ebb & flow of ancient empires the French Revolution & the rise of fascism in Europe in the 19th century? These are some of the claims made for volcanic cataclysm. Volcanologist Clive Oppenheimer explores rich geological historical archaeological & palaeoenvironmental records (such as ice cores & tree rings) to tell the stories behind some of the greatest volcanic events of the past quarter of a billion years. He shows how a forensic approach to volcanology reveals the richness & complexity behind cause & effect & argues that important lessons for future catastrophe risk management can be drawn from understanding events that took place even at the dawn of human origins.