By the violent crime statistics this is the point in time. But that has no relation to global warming or our (in)ability to deal with it. It might be too late or it might be no problem at all, but the current best research indicates it is going going to be a huge problem.
It is almost as if you are intentionally missing the point.
You make it sound as though wishful thinking and impossible are benefits.
Please don't complicate an already difficult situation this is a place where simple trolling for fun can and does cause real harm. Climate change deniers will point at trolls like you and claim to have more people on their side than really exist.
I would not pretend knowing what happened thousands of years ago. We only have glimpse of what happened before the roman empire. Maybe societies were less technologically advanced but happier and wiser ? Hard to tell.
Parochial or primitive societies are not fun places to live in. Stereotypes, superstitions, myths, homophobia, chauvinism and oppression of women, oppression by the church, tribal wars, are all attributes.
Again, that's how we picture them in our head, but we have very few informations of what really happened at that time. Pretending we know from a few remaining artefact's is quite a stretch given that the truth is already very distorted when information from the same day arrive to you in the form of photos, videos and track records.
I have greater hopes for my 11-year-old than conservation of mass.