As an example (V1.0) of just how much difference between areas there is, Selesia in southern Poland suffered 97% casualties while the US was something like 50%.
Countries not directly involved it the war and far from any fighting are likely to have been only lightly touched - maybe 10% losses due to famine and disease.
As the warring countries are also the most populated on the whole, the global reduction might run at about 50-60% (wild guess on my part) possibly more depending on just how badly China with it's billions of people was hit.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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