"Out of curiosity, are there enough nukes to theoretically remove all life? What about all mammals?"
You might want to watch this episode of VICE for their take of the conflict between India and Pakistan ... and the potential destruction of Earth from their nuke arsenals. It addresses that very question.
The last 30 seconds of that video mention it but there way off base. Humanity has done a lot of above ground nuclear testing and for the most part unless your vary close it's simply a slight increase in cancer risk.
You might want to watch this episode of VICE for their take of the conflict between India and Pakistan ... and the potential destruction of Earth from their nuke arsenals. It addresses that very question.
https://www.youtube.com/watch?v=2Nzm2CidMpM