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A disaster is an event that causes serious harm to people, buildings, economies, or the environment, and the affected community cannot handle it alone.<ref name="ifrc" /><ref name="EHA" />Template:Bsn Natural disasters like avalanches, floods, earthquakes, and wildfires are caused by natural hazards.<ref name=":3">{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref> Human-made disasters like oil spills, terrorist attacks and power outages are caused by people. Nowadays, it is hard to separate natural and human-made disasters because human actions can make natural disasters worse.<ref name=":12">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=":22">Template:Cite journal</ref><ref name=":42">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Climate change also affects how often disasters due to extreme weather hazards happen.
Disasters usually hit people in developing countries harder than people in wealthy countries. Over 95% of deaths from disasters happen in low-income countries, and those countries lose a lot more money compared to richer countries. For example, the damage from natural disasters is 20 times greater in developing countries than in industrialized countries.<ref name="WB" /><ref name="PESOS" /> This is because low-income countries often do not have well-built buildings or good plans to handle emergencies.
To reduce the damage from disasters, it is important to be prepared and have fit for purpose infrastructure. Disaster risk reduction (DRR) aims to make communities stronger and better prepared to handle disasters. It focuses on actions to reduce risk before a disaster occurs, rather than on response and recovery after the event. DRR and climate change adaptation measures are similar in that they aim to reduce vulnerability of people and places to natural hazards.
When a disaster happens, the response includes actions like warning and evacuating people, rescuing those in danger, and quickly providing food, shelter, and medical care. The goal is to save lives and help people recover as quickly as possible. In some cases, national or international help may be needed to support recovery. This can happen, for example, through the work of humanitarian organizations.
DefinitionsEdit
The UN defines a disaster as "a serious disruption of the functioning of a community or a society at any scale".<ref name="UNGA">UNGA (2016). Report of the open-ended intergovernmental expert working group on indicators and terminology for disaster risk reduction. United Nations General Assembly (UNGA).</ref>Template:Rp It results from hazards in places where people live in exposed or vulnerable conditions. Some human failures make communities vulnerable to climate hazards. These are poor planning or development, or a lack of preparation.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Disasters are events that have an effect on people. A hazard that overwhelms or injures a community is considered a disaster.<ref>Zibulewsky, Joseph (April 14, 2001). "Defining disaster: the emergency department perspective". National Library of Medicine. Retrieved October 21, 2023.</ref> The international disaster database EM-DAT defines a disaster as “a situation or event that overwhelms local capacity, necessitating a request for external assistance at the national or international level; it is an unforeseen and often sudden event that causes great damage, destruction and human suffering.”<ref name=":6">CRED. 2023 Disasters in Numbers: Climate in Action. (2024). https://files.emdat.be/reports/2023_EMDAT_report.pdf</ref> The effects of a disaster include all human, material, economic and environmental losses and impacts.<ref name="UNGA" />Template:Rp
UNDRO (1984) defined a disaster in a more qualitative fashion as:<ref name="Smith 1996">Smith 1996 quoted in Template:Cite book</ref> "an event, concentrated in time and space, in which a community undergoes severe danger and incurs such losses to its members and physical appurtenances that the social structure is disrupted and the fulfilment of all or some of the essential functions of the society is prevented." Like other definitions this looks beyond the social aspects of the disaster impacts. It also focuses on losses. This raises the need for emergency response as an aspect of the disaster.<ref name="Smith 1992">Template:Cite book</ref> It does not set out quantitative thresholds or scales for damage, death, or injury.Template:Citation needed
A study in 1969 defined major disasters as conforming to the following criteria, based on the amount of deaths or damage:<ref name="Smith 1992" /><ref name="Sheehan and Hewitt 1969">Template:Cite report</ref> At least 100 people dead, at least 100 people injured, or at least $1 million damage. This definition includes indirect losses of life caused after the initial onset of the disaster. These could be the effects of diseases such as cholera or dysentery arising from the disaster. This definition is still commonly used. However it is limited to the number of deaths, injuries, and damage in money terms.<ref name="Smith 1992" />
TypesEdit
The scale of a disaster matters. Small-scale disasters only affect local communities but need help beyond the affected community. Large-scale disasters affect wider society and need national or international help.<ref name="UNGA" />
It is usual to divide disasters into natural or human-made. Recently the divide between natural, man-made and man-accelerated disasters has become harder to draw.<ref name=":12"/><ref name=":2">Template:Cite journal</ref><ref name=":42"/> Some manufactured disasters such as smog and acid rain have been wrongly attributed to nature.<ref name="China.NYT">Template:Cite newsTemplate:Cbignore</ref>
Related to natural hazardsEdit
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Disasters with links to natural hazards are commonly called natural disasters. However experts have questioned this term for a long time.<ref>Cannon, Terry. (1994). Vulnerability Analysis and The Explanation Of 'Natural' Disasters. Disasters, Development and Environment.</ref>
| Example | Profile |
|---|---|
| Avalanche | The sudden, drastic flow of snow down a slope, occurring when either natural triggers, such as loading from new snow or rain, or artificial triggers, such as explosives or backcountry skiers. |
| Blizzard | A severe snowstorm characterized by very strong winds and low temperatures |
| Earthquake | The shaking of the Earth's crust, caused by underground volcanic forces of breaking and shifting rock beneath the Earth's surface |
| Fire (wild) | Fires that originate in uninhabited areas and which pose the risk to spread to inhabited areas (see also Wildfire § Climate change effects) |
| Flood | Flash flooding: Small creeks, gullies, dry streambeds, ravines, culverts or even low-lying areas flood quickly (see also Effects of climate change) |
| Freezing rain | Rain occurring when outside surface temperature is below freezing |
| Heat wave | A prolonged period of excessively hot weather relative to the usual weather pattern of an area and relative to normal temperatures for the season (see also Effects of climate change § Heat waves and temperature extremes). |
| Landslide | Geological phenomenon which includes a range of ground movement, such as rock falls, deep failure of slopes and shallow debris flows |
| Lightning strike | An electrical discharge caused by lightning, typically during thunderstorms |
| Limnic eruption | The sudden eruption of carbon dioxide from deep lake water |
| Tropical cyclone | Rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls (see also Tropical cyclones and climate change) |
| Tsunami | A series of waves hitting shores strongly, mainly caused by the displacement of a large volume of a body of water, typically an ocean or a large lake, usually caused by earthquakes, volcanic eruptions, underwater explosions, landslides, glacier calvings, meteorite impacts and other disturbances above or below water |
| Volcanic eruption | The release of hot magma, volcanic ash and/or gases from a volcano |
Edit
Human-made disasters are serious harmful events caused by human actions and social processes. Technological hazards also fall into this category. That is because they result in human-instigated disasters. Human-made hazards are sometimes called anthropogenic hazards.<ref name="UNGA" />Template:Rp Examples include criminality, social unrest, crowd crushes, fires, transport accidents, industrial accidents, power outages, oil spills, terrorist attacks, and nuclear explosions/nuclear radiation.<ref name=":0">Template:Cite journal</ref> Catastrophic climate change, nuclear war, and bioterrorism also fall into this category.
Climate change and environmental degradation are sometimes called socio-natural hazards. These are hazards involving a combination of both natural and human factors.<ref name="UNGA" /> Template:Rp All disasters can be regarded as human-made, because of failure to introduce the right emergency management measures.<ref name="atrisk">Blaikie, Piers, Terry Cannon, Ian Davis & Ben Wisner. At Risk – Natural hazards, people's vulnerability and disasters, Wiltshire: Routledge, 2003, Template:ISBN</ref>
Famines may be caused locally by drought, flood, fire or pestilence. In modern times there is plenty of food globally. Long-lasting local shortages are generally due to government mismanagement, violent conflict, or an economic system that does not distribute food where needed.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
| Disaster | Profile |
| Bioterrorism | The intentional release or dissemination of biological agents as a means of coercion |
| Civil unrest | A disturbance caused by a group of people that may include sit-ins and other forms of obstructions, riots, sabotage and other forms of crime, and which is intended to be a demonstration to the public and the government, but can escalate into general chaos |
| Fire (urban) | Even with strict building fire codes, people still perish in fires |
| Hazardous material spills | The escape of solids, liquids, or gases that can harm people, other living organisms, property or the environment, from their intended controlled environment such as a container. |
| Nuclear and radiation accidents | An event involving the significant release of radioactivity to the environment or a reactor core meltdown and which leads to major undesirable consequences to people, the environment, or the facility |
| Power failure | Caused by summer or winter storms, lightning or construction equipment digging in the wrong location |
OthersEdit
Complex disasters, where there is no single root cause, are more common in developing countries. A specific hazard may also spawn a secondary disaster that increases the impact. A classic example is an earthquake that causes a tsunami. This results in coastal flooding, damaging a nuclear power plant on the coast. The Fukushima nuclear disaster is a case in point. Experts examine these cascading events to see how risks and impacts can amplify and spread. This is particularly important given the increase in climate risks.<ref name=":10">Ara Begum, R., R. Lempert, E. Ali, T.A. Benjaminsen, T. Bernauer, W. Cramer, X. Cui, K. Mach, G. Nagy, N.C. Stenseth, R. Sukumar, and P. Wester, 2022: Chapter 1: Point of Departure and Key Concepts. In: Climate Change 2022: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [H.-O. Pörtner, D.C. Roberts, M. Tignor, E.S. Poloczanska, K. Mintenbeck, A. Alegría, M. Craig, S. Langsdorf, S. Löschke, V. Möller, A. Okem, B. Rama (eds.)]. Cambridge University Press, Cambridge, UK and New York, NY, USA, pp. 121–196, doi:10.1017/9781009325844.003.</ref>Template:Rp
Some researchers distinguish between recurring events like seasonal flooding and unpredictable one-off events.<ref>Template:Cite journal</ref> Recurring events often carry an estimate of how often they occur. Experts call this the return period.
ImpactsEdit
Template:Further The effects of a disaster include all human, material, economic and environmental losses and impacts.<ref name="UNGA" />Template:Rp
The Emergency Events Database (EM-DAT) records statistics about disasters related to natural hazards. For 2023, EM-DAT recorded 399 disasters, which was higher than the 20-year average of 369.<ref name=":6" />
Economic lossesEdit
Between 2016 and 2020 the total reported economic losses amounted to $293 billion. This figure is likely to be an underestimation. It is very challenging to measure the costs of disasters accurately, and many countries lack the resources and technical capacity to do so.<ref name="UNDRR-2">UNDRR (2023). The Report of the Midterm Review of the Implementation of the Sendai Framework for Disaster Risk Reduction 2015–2030. UNDRR: Geneva, Switzerland.</ref>Template:Rp Over the 40-year period from 1980 to 2020 losses were estimated at $5.2 trillion.
Human impactsEdit
In 2023, natural hazard-related disasters resulted in 86,473 fatalities and affected 93.1 million people.<ref name=":6" /> Whilst the number of deaths was much higher than the 20-year average of 64,148, the number affected was much lower than the 20-year average of 175.5 million.
According to a UN report, 91% of deaths from hazards from 1970 to 2019 occurred in developing countries.<ref name="United Nations Office for Disaster Risk Reduction-2023">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> These countries already have higher vulnerability and lower resilience to these events, which exacerbates the effects of the hazards.
Effects of climate changeEdit
Hazards such as droughts, floods, and cyclones are naturally occurring phenomena.<ref>Ara Begum, R., R. Lempert, E. Ali, T.A. Benjaminsen, T. Bernauer, W. Cramer, X. Cui, K. Mach, G. Nagy, N.C. Stenseth, R. Sukumar, and P. Wester, 2022: Chapter 1: Point of Departure and Key Concepts. In: Climate Change 2022: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [H.-O. Pörtner, D.C. Roberts, M. Tignor, E.S. Poloczanska, K. Mintenbeck, A. Alegría, M. Craig, S. Langsdorf, S. Löschke, V. Möller, A. Okem, B. Rama (eds.)]. Cambridge University Press, Cambridge, UK and New York, NY, USA, pp. 121–196, {{#invoke:doi|main}}</ref> However, climate change has caused these hazards to become more unreliable, frequent and severe. They thus contribute to disaster risks. Countries contributing most to climate change are often at the lowest risk of feeling the consequences.<ref name=":5">IPCC, 2023: Sections. In: Climate Change 2023: Synthesis Report. Contribution of Working Groups I, II and III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [Core Writing Team, H. Lee and J. Romero (eds.)]. IPCC, Geneva, Switzerland, pp. 35-115, doi: 10.59327/IPCC/AR6-9789291691647</ref> As of 2019, countries with the highest vulnerability per capita release the lowest amount of emissions per capita, and yet still experience the most heightened droughts and extreme precipitation.<ref name=":5" />
Prevention and responseEdit
Disaster risk reductionEdit
Disaster responseEdit
EtymologyEdit
The word disaster is derived from Middle French {{#invoke:Lang|lang}} which comes from Old Italian {{#invoke:Lang|lang}}. This in turn comes from the Ancient Greek pejorative prefix {{#invoke:Lang|lang}}- (Template:Transliteration-) "bad"<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and {{#invoke:Lang|lang}} (Template:Transliteration), "star".<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> So the word disaster ("bad star" in Greek) comes from an astrological sense of a calamity blamed on the position of planets.<ref>"Disaster" in Etymology online</ref>
See alsoEdit
- Template:Annotated link
- Template:Annotated link
- List of accidents and disasters by death toll
- Lists of disasters
ReferencesEdit
External linksEdit
Template:Sister project Template:Sister project links
- ReliefWeb of the United Nations Office for the Coordination of Humanitarian Affairs –ReliefWeb
- United Nations Office for Disaster Risk Reduction – UNDRR
- Global Disaster Alert and Coordination System – a joint initiative of the United Nations Office for the Coordination of Humanitarian Affairs (OCHA) and the European Commission