All nuclear explosions themselves aren't even going to be statistically detectable.
IIRC from assessments of the US military's carbon footprint, cumulative footprint of nuclear weapons infrastructure is probably significantly less than .1%
There's a hundred other things to worry about first IMO.
A Time-Lapse Map of Every Nuclear Explosion Since 1945 - by Isao Hashimoto https://www.youtube.com/watch?v=LLCF7vPanrY
1 second = 1 month