I didn't assume you were talking about nuclear warfare. Sorry for not being clear. I was point out how difficult it is to wipe out ~7 billion people, even with

I didn't assume you were talking about nuclear warfare. Sorry for not being clear. I was point out how difficult it is to wipe out ~7 billion people, even with extremely advanced technology. Nuclear winter is just a convenient benchmark of that. The same resilience mankind has against nuclear winter is also applicable against genetic engineering, climate change, and nano-tech disasters.