Worst case scenario- after 1900

Nuclear war any time after the mid-'60s (i.e., once the Soviets had a sufficiently large nuclear arsenal to destroy the US). Before that, about half the world could survive; after that, the end.
 
You cant have a large scale nuclear war.
With 2 sides developing enought nukes to eliminate 10-100 planets like this its a NEVER to use weapon only if u wish to suicide urself.
 
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