BBC: These are the apocalypse risks that can eliminate the entire population of the Earth.

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Bee cry: Pesticides and parasites can kill bees. In this way there is no eating grain, and food is gone.

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Nuclear Armageddon: Nuclear war breaks out. The dust released in the atmosphere blocks sunlight, causing a nuclear winter. Danger: Uncertain life.

Bioterrorism: A deadly microbe develops as biological weapons, causing a global epidemic.

Loss of arable land: Misused deforestation and agriculture result in loss of arable land. The plants no longer grow, and the earth is desolated.
Natural epidemic: A deadly microbe causes a global epidemic.

Apocalypse combined: A series of disasters creates a chain of events that mankind is unable to handle.

Overcrowding: Human population growth harms the environment and goes beyond Earth's capacity to produce food.
nanotechnology weapons: Atomic production accurately brings the production of new deadly weapons.

Climate change: Human activity changes the balance of gases in earth's atmosphere, heating the climate.
Super defect artificial intelligence: A super-planned intelligence badly destroys all mankind.

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Subpopulation: The decline in fertility rates in many lands causes the human population to die down.

Genoin failure: The human effort to get CO2 out of the atmosphere and reflect the light of the sun back into space goes wrong.

Grey-Goo: Microscopic nanobots decide to destroy everything in the Universe, creating the so-called Grey Goo.

Post-humanity: Strange human beings no longer exist because of genetic engineering and other technological advances.
Increase in sea level: Climate warming causes ocean thermal expansion and ice melting.
Supervolcanan: A huge volcanic eruption releases clouds of smoke and ash that block sunlight and cool the globe.
Metathan's Deliverance: Methane, released from the melting of the ice layer in the earth's crust and from the ocean floor, causes global warming to break out of control.
asteroid hit: An asteroid or large comet hits Earth or moon.
Alien invasion: We fight in hostile aliens that invade us with their super-tech.

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Venus syndrome: Extreme climate change makes the earth as hot as its neighbor Venus.
Unknown Something very deadly and inevitable happens that we have no idea of today.

Gama ray blast: A star explodes, emitting Gama radiation that destroys the entire ozone layer on Earth.

Screenplay Matrix: Our universe turns to be a simulation and simply “will be”.
Death of the Sun: The sun expands into a red giant as it approaches the end of life. In doing so, he swallows up the internal planets, including the Earth.
Death of the Universe: The universe ends as a result of either enlargement or collapse. / BBC