Which is most likely to bring an end to civilization and why?

E

Entity

New member
nuclear warfare
non-nuclear warfare
overpopulation
pollution
global warming
giant meteor/comet/bigass rock
the hand of god
satan
religion
depleting the life-supporting resources of the planet
reset button
aliens
the jews
robots
clone armies
genetically engineered armies
Ghengis Khan
the emo epidemic
some future technology
or perhaps something else?

please, explain your thoughts..
 
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