Destroying the World

 

There are a couple of things to consider when creating apocalyptic events, namely:
>Is this an all-planet apocalypse?
>Is this a part-planet apocalypse?
>>Have unaffected areas offered help?
>>Have they offered help and been refused by the government of the affected area?
>>Did the event somehow go unnoticed?
>>Do people from affected places know that there are unaffected places?
>>>Do they have any facts about this, or is everything to do with the matter just speculation for them?

The next thing to consider is if the event is caused by living creatures or not.

Caused by living creatures:
>Ultra mega world war, with mass destruction, mass death, etc
>Nuclear war
>Divine intervention
>Aliens
>Super poison into waterways
>Over-hunting of apex predators, causing surplus of prey animals and widespread ecological damage. (This would have to be done on a very large scale to get to an ‘apocalyptic event’ level, however, it can compound with other problems to make them much more severe.)
>Over-hunting of scavenger predators, causing contamination from corpses into earth and water supply. (This would have to be done on a very large scale to get to an 'apocalyptic event’ level, however, it can compound with other problems to make them much more severe.)

Caused by non-living creatures
>Supervolcano (don’t worry, scientists think this is unlikely to happen at Yellowstone, but there’s a reason when novels are found in the fiction section.)
>Ice age
>Massive tectonic movement
>>earthquakes, earth-splitting, sudden mountains
>Worldwide plagues (this video is easy to understand and explains why plagues start)
>Mass flooding (can be caused by:)
>>Global warming-ice caps melting
>>Mass rainfall (effects are localized)
>>Hurricanes and typhoons (effects are localized)
>>Broken dam (natural dams, such as ice dams, or man-made) (effects are localized)
>Deterioration of ozone
>Huge asteroid
>Crop blights

And, of course, things like zombies, demons, and other angry monsters can also decide it’s hunting season of your characters’ species.