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The worst natural disaster in recorded history is the 1931 Central China Floods, which is the deadliest natural event in terms of death toll, with up to 4 million casualties. It was caused by heavy flooding from snowstorm melt-off and an unusual number of cyclones following a two-year drought; it affected all of China's major rivers, including the Yellow, the Yangtze and the Huai. Many died from drowning; others died from water-borne diseases such as typhus and cholera.

Another strong contender is the 1815 explosion of Mount Tambora in Indonesia, which killed more than 70,000 people directly, and blasted so much dust into the atmosphere that crops failed worldwide the following year, in what came to be known as "The Year Without a Summer."

However, the worst disaster in Earth's history was the Permian-Triassic Extinction Event, also known as The Great Dying, which occurred 251 million years ago. 96% of marine species, and 70% of land species, were killed off. Scientists still debate the cause of the event, with leading theories pointing to a critical combination of meteor strikes, massive volcanic eruptions, and a sudden release of poisonous methane gas from pockets of pressurized methane ice located on or under the sea floor.

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15y ago

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