Are they just talking about erasing cities/mankind from the surface or the combined energy from them all is enough to significantly disfigure the surface? Or would it be the aftereffects of the bombs that cause the destruction?
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As impressive and terrifying as the explosions themselves are, most of the death (not just to humans, but all life in general) would come from the nuclear winter that follows. Basically loads of dust would be kicked into the atmosphere, and global wildfires would release massive amounts of ash as well. All in all much of the sun’s light wouldn’t hit the ground, and these particulates would stay in the air for up to 20 years.
In the timespan of less than a year global temperatures would drop to below what we had during the last ice age. Global crop failures, mass extinction, civilisation would be totally screwed (even stuff far from the explosions themselves), and humanity itself may go extinct.
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