Natural Disaster Setting
Geological Disasters
Earthquakes
Volcanoes
Tsunamis or Tidal Waves
Giant Storms
Tornadoes
Hurricanes, Typhoons, or Cyclones
Hot & Cold, Fire or Ice
Ice Age
Solar Flare
Ozone & Global Warming
Meteors, Comets, & Asteroids
Natural Catastrophes
Biological or Environmental Collapse
Contagious Virus or Bacteria Outbreak or Plague
Zombie Apocalypse