Disasters Emergency management 42 Natural disasters 33 History 24 Civilization, Medieval 20 Environmental risk assessment 10 History, Modern 10 Planning 9 Social aspects 9 System failures (Engineering) 7 1809-1882 6 Darwin, Charles 6 Psychological aspects 6 Terrorism 6 Case studies 5 Disaster relief 5 Environmental aspects 5 Influence 5 Disaster Planning 4 Prevention 4 Security measures 4 September 11 Terrorist Attacks, 2001 4 Buildings 3 Crisis management 3 Flood damages 3 Hazard mitigation 3 Islam 3 Religious aspects 3 Risk management 3 20th century 2