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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, [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 ".
However, as the Sun grows gradually hotter (over millions of years), Earth may become too hot for life as early as one billion years from now. [212] [213] [214] 1.3 billion Various It is estimated that all eukaryotic life will die out due to carbon dioxide starvation. Only prokaryotes will remain. [211] 7.59 billion David Powell
Asteroids with around a 1 km diameter have impacted the Earth on average once every 500,000 years; these are probably too small to pose an extinction risk, but might kill billions of people. [ 121 ] [ 123 ] Larger asteroids are less common.
Presently, only one person in the world understands the Doomsday argument, so by its own logic there is a 95% chance that it is a minor problem which will only ever interest twenty people, and I should ignore it. Jeff Dewynne and Professor Peter Landsberg suggested that this line of reasoning will create a paradox for the doomsday argument: [10]
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Doomsday may refer to: Eschatology , a time period described in the eschatological writings in Abrahamic religions and in doomsday scenarios of non-Abrahamic religions. Global catastrophic risk , a hypothetical event explored in science and fiction where human civilization or life is at risk of partial or complete destruction.
"Since its creation in 1947, the Doomsday Clock has been adjusted only 18 times, ranging from two minutes before midnight in 1953 to 17 minutes before midnight in 1991," said BAS.
The second reference to the 2060 prediction can be found in a folio, [64] in which Newton writes: So then the time times & half a time are 42 months or 1260 days or three years & an half, recconing twelve months to a yeare & 30 days to a month as was done in the Calendar of the primitive year.