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> we can live everywhere by adapting. It'll take more than thousands of warheads to wipe us out.

How do you adapt to having no food? It's entirely possible that most plant life on earth would cease to exist, with the corresponding collapse across the food chain killing most species of animals across the world.

Any humans left alive would need to eat whatever plant and animal life survived and was available on land in areas that radiation wasn't lethal.. which might be nowhere.

A single greenhouse could keep a single family alive long enough to eventually repopulate the Earth.

Killing most humans is a lot easier than killing all humans.

A greenhouse won't work when there's no sun, no electricity, and the water falling from the sky is toxic.

Hundreds of warheads would do the trick but it wouldn't take more than a two-week power outage to bring most civilizations currently on earth to the brink of collapse.

Not sure, our reproductive system is pretty sensible to radiation... we won't be wiped instantly but in a few generations we can get extint.