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You don't have to when you have the data for the end of the species, we know the rock we are on will still be here just we won't.
The human species will not end, we are way to many people for that. Even if 99,9% of people die, the remaining 8 000 000 people are more then enough to allow for stable populations even if those 8 000 000 are spread all over the globe in smaller communities.
assuming society collapses before nuclear war.
Even a nuclear war is highly unlikely to eradicate the human species as a whole, the sheer numbers of human beings makes us, as a species, extremely resilient against extinction.
That should not be understood as me saying that we can do whatever we want, not at all. On the contrary, we should do a lot to restore the damage we have done to the earth as fast as possible, or at least reduce the amount of damage we still do to zero if possible.