Semen retention prevents the body from experiencing acute long term radioactive sickness from background levels in the atmosphere so Noah is fine, don't worry about it
I'm pretty sure the original nuclear winter study was assuming a small war of just 100 nukes, tho I may be wrong (I half remembering something I heard in a VSauce video)
No, because the corollary of farming being incredibly efficient now is that it has a long and very nuke-able logistics chain from fertilizer to pest/herbicides to strains of modified crops.
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https://youtu.be/KzpIsjgapAk?si=D-PerN8h48B--Ozf
https://youtu.be/KzpIsjgapAk?si=D-PerN8h48B--Ozf