OTHER SUGGESTED SCENERIOS BRINGING EARTH TO AN END

A number of other scenarios have been suggested which can cause disaster on EARTH. Various risks exist for humanity, but not all are equal. Some that will almost certainly end humanity are certain to occur, but on a very long timescale. Others are likely to happen on a shorter timescale, but will probably not completely destroy civilization. Still others are extremely unlikely, and may even be impossible.

Some foreseen hazards (hence not members of the current category) which have been excluded from the list on grounds that they seem too unlikely to cause a global terminal disaster are: solar flares, supernovae, black hole explosions or mergers, gamma-ray bursts, galactic center outbursts, buildup of air pollution, gradual loss of human fertility, and various religious doomsday scenarios.