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not true if there is a cure for radiation poisoning, a 100% dependable missile defense system and energy/food source to get over a nuclear winter of 10-20 years. it is possible but not probable. einstein is einstein, and he is likely right.
If your lucky 10 to twenty years .In reality more like 50 years to as much as 100 years . Where you gonna get 100 years of water that is non radiation proof? We humans can`t live without water .