A study found that a nuclear war between the U.S. and Russia would kill more than 5 billion people – just from starvation
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Global food insecurity and famine from reduced crop, marine fishery and livestock production due to climate disruption from nuclear war soot injection - Nature Food
https://www.nature.com/articles/s43016-022-00573-0#Sec5
Calorie availability and extent of food shortages for each nation are estimated following regional or global nuclear war, including impacts on major crops, livestock and fishery production.