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Gray goo is another catastrophic scenario, which was proposed by Eric Drexler in his 1986 book Engines of Creation [76] and has been a theme in mainstream media and fiction. [77] [78] This scenario involves tiny self-replicating robots that consume the entire biosphere using it as a source of energy and building blocks. Nowadays, however ...
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.
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 ".
−4 The Soviet Union tests its first atomic bomb, the RDS-1, starting the nuclear arms race. 1953 2 23:58 −1 The United States tests its first thermonuclear device in November 1952 as part of Operation Ivy, before the Soviet Union follows suit with the Joe 4 test in August. This remained the clock's closest approach to midnight (tied in 2018 ...
An impact event is commonly seen as a scenario that would bring about the end of civilization. In 2000, Discover magazine published a list of 20 possible sudden doomsday scenarios with an impact event listed as the most likely to occur.
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 .
Unknown; may include climate changes, massive volcanic eruptions and Humans (largely by human overhunting) [4] [5] [6] Neogene: Pliocene–Pleistocene boundary extinction: 2 Ma: Possible causes include a supernova [7] [8] or the Eltanin impact [9] [10] Middle Miocene disruption: 14.5 Ma Climate change due to change of ocean circulation patterns.
They found that studies generally assumed a scenario where half of the world's nuclear weapons would be used, ~5000 Mt, destroying approximately 1,000 cities, and creating large quantities of carbonaceous smoke – 1– 2 × 10 14 g being most likely, with a range of 0.2– 6.4 × 10 14 g (NAS; TTAPS assumed 2.25 × 10 14). The smoke resulting ...