Earth - Wind - Fire
You can interpret those as you see fit, whatever genre.
So, for the first, the end of the world comes about through some
earth related disaster. Like:
- massive earthquakes
- a renewal of volcanic activity due to us messing with the core or something
- meteorites smashing into us
- or??
For the second,
wind, the end of the world comes about through some meteorological related disaster:
- a massive, rapid ice age
- a thinning atmosphere for whatever reason (ozone layer is shot, etc)
- a wizard has a massive fart
- or??
For the third,
fire, the end of the world comes about through some fire or
war related disaster:
- fire breathing dragons are created in someone cobbling together winged dinosaurs and something, creating intelligent, fire breathing minions!
- nuclear Armageddon
- a wizard puts a match to his rear end just as he is about to fart
- or??
I hope that sparks the imagination.

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