Human extinction
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Human extinction, or omnicide, refers to the possible ending of the human species, either by population decline due to singular natural events—for example, space irradiation, asteroid impact, or large
Nuclear war is an often predicted cause of the extinction of humankind.
Castle Romeo nuclear test on Bikini Atoll
Placard against omnicide, at Extinction Rebellion (2018)
Global catastrophic risk
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A global catastrophic risk or a doomsday scenario is a hypothetical event that could damage human well-being on a global scale, endangering or even destroying modern civilization. Existential risk is
Human extinction
…example, space irradiation, asteroid impact, or large-scale volcanism—or via anthropogenic destruction (self-extinction). Some of the many possible contributors to anthropogenic hazards are climate change, global nuclear annihilation, biological warfare, weapons of mass destruction, and ecological collapse. Other scenarios center on…
Artist's impression of a major asteroid impact. An asteroid caused the extinction of the non-avian dinosaurs.