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A disaster is a serious disruption of the functioning of a community or a society involving widespread human, material, economic or environmental losses and impacts, which exceeds the ability of the affected community or society to cope using its own resources.
In contemporary academia, disasters are seen as the consequence of inappropriately managed risk. These risks are the product of a combination of both hazard/s and vulnerability. Hazards that strike in areas with low vulnerability will never become disasters, as is the case in uninhabited regions.
Developing countries suffer the greatest costs when a disaster hits – more than 95 percent of all deaths caused by hazards occur in developing countries, and losses due to natural hazards are 20 times greater (as a percentage of GDP) in developing countries than in industrialized countries.
The word disaster is derived from Middle French désastre and that from Old Italian disastro, which in turn comes from the Greek pejorative prefix δυσ-, (dus-) "bad" and ἀστήρ (aster), "star". The root of the word disaster ("bad star" in Greek) comes from an astrological sense of a calamity blamed on the sight of planets.
Researchers have been studying disasters for more than a century, and for more than forty years disaster research. The studies reflect a common opinion when they argue that all disasters can be seen as being human-made, their reasoning being that human actions before the strike of the hazard can prevent it developing into a disaster. All disasters are hence the result of human failure to introduce appropriate disaster management measures. Hazards are routinely divided into natural or human-made, although complex disasters, where there is no single root cause, are more common in developing countries. A specific disaster may spawn a secondary disaster that increases the impact. A classic example is an earthquake that causes a tsunami, resulting in coastal flooding.
A natural hazard is a natural process or phenomenon that may cause loss of life, injury or other health impacts, property damage, loss of livelihoods and services, social and economic disruption, or environmental damage.
Various phenomena like earthquakes, landslides, volcanic eruptions, floods, hurricanes, tornadoes, blizzards, tsunamis, and cyclones are all natural hazards that kill thousands of people and destroy billions of dollars of habitat and property each year. However, the rapid growth of the world's population and its increased concentration often in hazardous environments has escalated both the frequency and severity of disasters. With the tropical climate and unstable land forms, coupled with deforestation, unplanned growth proliferation, non-engineered constructions which make the disaster-prone areas more vulnerable, tardy communication, and poor or no budgetary allocation for disaster prevention, developing countries suffer more or less chronically from natural disasters. Asia tops the list of casualties caused by natural hazards.
Human-instigated disasters are the consequence of technological hazards. Examples include stampedes, fires, transport accidents, industrial accidents, oil spills and nuclear explosions/radiation. War and deliberate attacks may also be put in this category. As with natural hazards, man-made hazards are events that have not happened—for instance, terrorism. Man-made disasters are examples of specific cases where man-made hazards have become reality in an event.
- Act of God
- List of accidents and disasters by death toll
- Civil protection
- Disaster medicine
- Disaster convergence
- Disaster response
- Disaster recovery
- Disaster area
- Disaster research
- Disaster recovery plan
- Disaster recovery and business continuity auditing
- Disaster opportunism
- Disaster Mitigation Act of 2000
- Emergency management
- Environmental emergency
- Human extinction
- List of disasters
- List of disasters by cost
- Maritime disasters
- Risk governance
- Risks to civilization, humans and planet Earth
- Sociology of disaster
- The Klaxon.com
- Disaster film
- List of military disasters
- List of railway disasters
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- The Disaster Roundtable Information on past and future Disaster Roundtable workshops
- EM-DAT The EM-DAT International Disaster Database
- RSOE EDIS Emergency and Disaster Information Service An up-to-the-minute world wide map showing current disasters.
- Articles On Food Shortage – Food Shortage Information.
- Global Disaster Alert and Coordination System A United Nations and European Commission sponsored website for disaster information.
- United Nations Programme for Space-based Information for Disaster Management and Emergency Response
- Disaster Video Archive Archive Footage of Major Disasters
- Guinness Book of World Records
- The world's worst massacres Whole Earth Review
- War Disaster and Genocide
- Disaster Video Disaster News and Video
- Disaster Alert Notification and Reporting
- RSOE EDIS (Emergency Disaster and Information Service): world map showing current disasters
- The Disaster News Network – Live Monitors and Updates about Disasters
- The Calamity of Disaster – Recognizing the possibilities, planning for the event, managing crisis and coping with the effects.
- Corporate Disaster Resource Network, India
- United Nations International Strategy for Disaster Reduction
- European Council for Disaster Medicine