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Thousands of lifes and millions if not billions affected to various degree in order to slightly cool down our planet (I think the point of reducing emissions is not to prevent global warming but to rather keep the air we breathe not too contaminated?)? Jokes aside, maybe the nuclear tests in the 30s,40s and 60s were the reason why the globe has become slightly colder to begin with, and what is being observed now is just out planet recovering from a reasonably rough century of forceful cooling down inflicted by nuclear events?

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Nuclear weapons don't magically cool the planet, and "a little nuke" doesn't cool it "less than a big nuke". Nuclear winter is caused by smoke, dust and ash blocking out sunlight.

EB has a surprisingly short and to-the-point summary of it. https://www.britannica.com/science/nuclear-winter