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Kurzgesagt – In a Nutshell - What If We Detonated All Nuclear Bombs at Once?

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Author: Kurzgesagt – In a Nutshell
Categories: History Science
Tags: history, science
Views: 2 · Last viewed: 2026-10-16 00:54 UTC

Short Summary

Main recommendation: No recommendation is given; the video is a thought experiment answering whether detonating all of Earth's nuclear weapons at once would end civilization. Its answer is that a 15,000-warhead detonation would devastate South America and cause a global nuclear winter, but humanity would survive, while a uranium-maximized detonation would cause human extinction. The video is best understood as a calculated what-if scenario rather than practical advice.

Key Points

  • Earth holds about 15,000 nuclear weapons: roughly 7,000 each for the US and Russia, with around 1,000 shared among France, China, the UK, Pakistan, India, Israel, and North Korea.
  • Those warheads could destroy every urban area of 100,000+ people (about 4,500 cities) roughly three times over, killing over three billion people.
  • Combined, the 15,000 warheads equal about three billion tons of TNT, roughly 15 times the energy of the 1883 Krakatoa eruption.
  • The detonation would create a fireball about 50 km across, flatten about 3,000 square kilometers of forest, and leave a crater about 10 km wide.
  • Fallout would double worldwide radioactive material (still not civilization-ending, though possibly more cancer) and could cause a few years of nuclear winter lowering global temperatures by a few degrees.
  • The video's second scenario mines Earth's estimated 35 million tons of uranium into a pile equal to 10 billion Hiroshima bombs, which it concludes would cause humanity's extinction.

Details Worth Noting

  • Concrete instructions: The video gives no actionable steps, purchases, dosages, or preparations; it is a hypothetical calculation only.
  • The video compares the 15,000-warhead yield to rebuilding the whole island of Manhattan, with every building made of stacked TNT, as a scale reference.
  • In the extinction scenario, the crater is about 100 km across, global earthquakes exceed any recorded event, and temperatures drop to near freezing worldwide for possibly decades.
  • Survivors in bunkers or deep submarines might last longest before running out of food, while the video notes the planet would recover within a few million years.
  • The video's closing point is that if intelligent life emerges again, it might find a thin layer of radioactive elements mixed with rare earth metals and plastics, and would probably be very confused.

Bottom Line

Even the full global arsenal would be catastrophic for regions like South America and the climate, but it would not end humanity; only a uranium-maximized arsenal would.