global catastrophic risk
risks of hypothetical future events that have the potential to harm humans and humanity on a global scale
nuclear holocaust
complete or nearly complete annihilation of human life through the use of nuclear weapons
impact winter
hypothesized extended period of worldwide cold weather due to the impact of a celestial body on the Earth's surface
mirror life
hypothetical form of life with mirror-reflected molecular building blocks (proteins, nucleic acids, etc.)
existential risk from artificial general intelligence
hypothesis that artificial general intelligence could result in human extinction
AI takeover
hypothetical scenario in which AI becomes the dominant form of intelligence on Earth
grey goo
hypothetical end-of-the-world scenario
post-apocalyptic scenario
scenario after doomsday