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Doomsday scenarios are possible events that could cause human extinction or the destruction of all or most life on Earth (a "true" or "major" Armageddon scenario), or alternatively a "lesser" Armageddon scenario in which the cultural, technological, environmental or social world is so greatly altered it could be considered like a different world.
The worst-affected city would likely be Billings, Montana, population 109,000, which the model predicted would be covered with ash estimated as 1.03 to 1.8 meters thick. [ 184 ] The main long-term effect is through global climate change, which reduces the temperature globally by about 5–15 °C for a decade, together with the direct effects of ...
Most likely underwater volcanism associated with the Caribbean large igneous province, which would have caused global warming and acidic oceans [14] Aptian extinction: 117 Ma: Unknown, but may be due to volcanism of the Rajmahal Traps [15] Jurassic: End-Jurassic (Tithonian) 145 Ma
Belief in the apocalypse is most prevalent in people with lower levels of education, lower household incomes, and those under the age of 35. [ 9 ] [ 10 ] In the United Kingdom in 2015, 23% of the general public believed the apocalypse was likely to occur in their lifetime, compared to 10% of experts from the Global Challenges Foundation .
A global catastrophic risk or a doomsday scenario is a hypothetical event that could damage human well-being on a global scale, [2] even endangering or destroying modern civilization. [3] An event that could cause human extinction or permanently and drastically curtail humanity's existence or potential is known as an " existential risk ".
Only a minority of publishing scientists have been more open to apocalyptic rhetoric. In 2009, Hans Joachim Schellnhuber, the Emeritus Director of the Potsdam Institute for Climate Impact Research, stated that if global warming reached 4 °C (7.2 °F) over the present levels, then the human population would likely be reduced to 1 billion. [8]
Gray goo (also spelled as grey goo) is a hypothetical global catastrophic scenario involving molecular nanotechnology in which out-of-control self-replicating machines consume all biomass (and perhaps also everything else) on Earth while building many more of themselves, [1] [2] a scenario that has been called ecophagy (the literal consumption of the ecosystem). [3]
National Response Scenario Number One is the United States federal government's planned response to a small scale nuclear attack. [1] It is one of the National Response Scenarios developed by the United States Department of Homeland Security , considered the most likely of fifteen emergency scenarios to impact the United States .