If nuclear war is inevitable does that mean it is unavoidable. How many billions will die and how many species of birds and mammals will go extinct?

Nuclear War Would Cause a Global Famine and Kill Billions, Rutgers-Led Study Finds
Nuclear War Would Cause a Global Famine and Kill Billions, Rutgers-Led Study Finds

More than 5 billion people would die of hunger following a full-scale nuclear war between the U. S. and Russia, according to a global study led by Rutgers climate scientists that estimates post-conflict crop production.

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I did not intend to be anonymous when I asked this question.
If nuclear war is inevitable does that mean it is unavoidable. How many billions will die and how many species of birds and mammals will go extinct?
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