deadliest climate Disasters in history

Climate disasters that kill large numbers of people have never been short,  single events. They are almost always caused by too much rain, or drought. They typically range over years, and sometimes as much as a decade. They usually occur within areas that are hundreds or even thousands of square miles. Death tolls are not the only measure. The number of people harmed by these events is always much larger. 

Because these events are long-lived, the data on deaths are always estimated, This is even true with the most recent event on this list. The East African drought and famine ended less than a decade ago. The range of fatalities runs from 50,000 to 260,000. And, as is true in all cases, the means of measurement differ. Recently the WHO reviewed data on a more recent environmental disaster which is the drought in Somalia which lasted from 2022 and 2024. The measure was “excess deaths” which is a term for the number of people who died compared to the number who would have died if the event had not occurred.  “A study released today by the Somali Federal Ministry of Health, UNICEF and WHO estimates that 71 100 people may have died between January 2022 and June 2024 because of the drought that ravaged large parts of Somalia in 2022.”

Most of these events happened more than a century ago, and in some cases a number of centuries .The Great Famine of Europe started in 1315.  According to the book “The Great Famine: Northern Europe in the Early Fourteenth Century” by William Chester Jordan, “The horrors of the Great Famine (1315-1322), was one of the severest catastrophes ever to strike northern Europe.” In The New Yorker, in 2016, Amy Davidson Sorkin titled “The Next Great Famine”, she wrote, “In some regions of Europe, the Great Famine of 1315-17 killed a tenth of the population, shattering social norms and local economies.” Her article supposes that there will be large famines in the future. 

Only one of these events occurred in America. The Dust Bowl Drought ran from 1934 to 1940.. The event is usually just called “The Dust Bowl.” The National Drought Mitigation Center reports, “Although it technically refers to the western third of Kansas, southeastern Colorado, the Oklahoma Panhandle, the northern two-thirds of the Texas Panhandle, and northeastern New Mexico, the Dust Bowl has come to symbolize the hardships of the entire nation during the 1930s.” The situation became so severe that, according to PBS, that in 1936, “The storm had already deposited 12 million pounds of dust on Chicago — four pounds for each person in the city — and was poised to descend on the nation’s capital.”

The most severe event on this list covered a large portion of the world. The Great Famine from 1876 to 1878 killed as many as 50 million people. It reached part of Africa, China, South America, and Australia. In a Journal of Climate article titled “Climate and the Global Famine of 1876–78.,” the authors described the extraordinary events that caused the widespread deaths. “Severe or record-setting droughts occurred on continents in both hemispheres and in multiple seasons, with the “Monsoon Asia” region being the hardest hit, experiencing the single most intense and the second most expansive drought in the last 800 years. “ This analysis puts total deaths at 50 million. 

To choose the list we considered high death tolls and direct links to climate variability.. This includes changes in temperature, both in oceans and on land, sharp changes in precipitation, changes in ongoing weather patterns which include El Niño and La Niña, or shifts in long-term climate patterns. Some of the events involve human decisions. The Dust Bowl was caused, in part, by farming practices.  

Among the sources used were the BBC, Columbia University’s climate program, The University of Chicago, Grist, the History Channel, Science Daily, and lists of climate disasters from other media. 

Event	Date	Regions Affected		Estimated Death Toll	Primary Climate Causes
Great Famine (Global Drought)	1876–1878	India, Northern China, Brazil, Morocco, parts of Africa and Australia		19–50 million globally	Strongest recorded El Niño event, combined with warm temperatures in the western Indian Ocean .Unusually heavy monsoon rains, alternating with multi-year droughts, triggered crop failures, which lead to widespread starvation.
Great Famine of Europe	1315–1317	Northern and Central Europe		5–7.5 million	Shift from what is known as the  Medieval Warm Period to the cooler “Little Ice Age,.” This triggered unusually heavy flooding, and year around cold. Excessive rain and flood cause rotted crops, leading to repeated harvest failures of grains
Dust Bowl Drought	1934–1940	US Great Plains (		~7,000 direct deaths primarily from dust pneumonia and related illnesses	Multi-year drought waves linked to ocean temperature anomalies which in this case was a cool Pacific, and warm Atlantic), This was worsened by land degradation. This causes prolonged dry spells in a region known for cyclic droughts.
Ethiopian Famine	1983–1985	Northern Ethiopia		300,000–1.2 million	Record low rainfall over multiple years), tied to El Niño influences that shifted rain patterns southward.
East Africa Drought/Famine	2010–2012	Somalia, Kenya, Ethiopia, Djibouti, Uganda		50,000–260,000	Strong La Niña events disrupted seasonal rains for two years, This resulted in precipitation less than 30% of average. This climate pattern delayed rains and intensified droughts