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 far as the planet is concerned, we are millennia away from doing anything meaningful to it.
We can disrupt the biosphere, cause mass extinctions and certainly kill ourselves off just fine, but earth as a planet is going to continue on, give or take a nuclear winter which lasts for less than an eyeblink on a cosmic scale.
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