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The irreversible global catastrophe is imperialist militaries massacring people with little risk to themselves. 
The irreversible global catastrophe is assembly line robots at the Toyota plant becoming sentient and going on a freaking epic terminator style mass shooting and enslave everyone except me 
it will be
all the AI and alien nonsense is just them preemptively constructing a scapegoat to assign blame to later on
aliens are real btw but whatever the media or congress says about them is gonna be fake