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If humans were extinct, Earth would be midway through a stable warm period with the next ice age due in 10,000 years, but if humans survived and did impact their planet, the greenhouse gas emissions would disrupt this natural cycle. [17] 10,000 – 1 million [note 1] The red supergiant stars Betelgeuse and Antares will likely have exploded as ...
A 1950 Gallup poll found that 19% of Americans believed that another world war would mean "an end to mankind". [11] Rachel Carson's 1962 book Silent Spring raised awareness of environmental catastrophe. In 1983, Brandon Carter proposed the Doomsday argument, which used Bayesian probability to predict the total number of humans that will ever exist.
[142] [143] [144] That is the key to why animals like giant tortoises can live so long. [145] Studies of humans with life spans of at least 100 have shown a link to decreased thyroid activity, resulting in their lowered metabolic rate. [citation needed]
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From the beginning of the current century there is a tendency to also estimate healthy life expectancy (HALE), the average number of years that a person can expect to live in "full health". [2] [3] Comparing life expectancies across countries can be problematic.
At long irregular intervals, Earth's biosphere suffers a catastrophic die-off, a mass extinction, [9] often comprising an accumulation of smaller extinction events over a relatively brief period. [10] The first known mass extinction was the Great Oxidation Event 2.4 billion years ago, which killed most of the planet's obligate anaerobes.
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An aging expert thinks humans can live for 20,000 years—and he might not be crazy. There's one major key to unlocking extreme longevity. An Aging Expert Thinks Humans Can Live for 20,000 Years.