system
Given the following post, respond as if you're commenting on Reddit:
human
Is it possible that all of the nuclear testing that has been done since WW2 has added to the severity of climate change?

I have always wondered if the thousands of nuclear tests that have been done have negatively affected the atmosphere or just the planet in general enough to cause worsened climate change or if they are just a metaphorical sneeze in comparison to the rest of humanity's pollution.
gpt
Not likely, we humans tend to imagine things at the scale of ourselves and at that level, atomic weapons are immense and powerful things.  At the scale of the planet though they're pretty insignificant.  

Nuclear winter was never actually going to be a thing, it was a misunderstanding and a bit of propaganda. An area that gets hit with a nuke isn't a wasteland for thousands of years...after a month you can travel through the area and after about 5 years it's perfectly fine to move back in.  Hiroshima has a population today of just over 2 million people, compared to the 245k that lived there before the bomb was dropped.

They burn all their energy in a a fraction of a second and will throw debris up into the air that won't settle completely for a little bit but not that long...but power plants are running 24/7/365 for *decades* on end, hundreds of millions of cars are pumping out exhaust incessantly every single day, giant ships are constantly crossing the oceans burning *gallons* of barely refined fuel oil for every mile they move...it all adds up to be so much more energy and so much more pollution than all the nuclear testing combined by a great many magnitudes.

A question that comes up sometimes is about an old idea the US military had to blow up a nuke on the moon as a show of dominance over the USSR but they got talked out of it because it wouldn't produce a visible result really.  Instead we sent a human being up there.  The math works out such that if we took the entire nuclear arsenal on the planet right now (about 1 million megatons estimated) and blew it up on the surface of the moon, you'd get a crater about 25ish kilometers across.  The smallest visible crater with the naked eye on the moon is about 40km.  And the total amount of nukes tested falls radically short of the total number stockpiled.