I can see some arguments in favour. We evolve along for millions of years and suddenly, bang, in 50ka we do this. It seems plausible we crossed some kind of threshold—and not everyone needs to be past the threshold for the world to be transformed.
OTOH, the first threshold might not be the only one.
I can see some arguments in favour. We evolve along for millions of years and suddenly, bang, in 50ka we do this. It seems plausible we crossed some kind of threshold—and not everyone needs to be past the threshold for the world to be transformed.
OTOH, the first threshold might not be the only one.