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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 ".
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]
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. [ 120 ] [ 122 ] Larger asteroids are less common.
Over the last 77 years, the clock’s time has changed according to how close the scientists believe the human race is to total destruction. Some years the time changes, and some years it doesn’t.
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.
"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.
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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. [207] [208] [209] 1.3 billion Various It is estimated that all eukaryotic life will die out due to carbon dioxide starvation. Only prokaryotes will remain. [206] 7.59 billion David Powell