I don’t know where you get your figures from, but the global fertility rate is still above replacement level,
Only when including several regions where fertility remains high (mostly Africa). If those are excluded, it's extinction-level. But hey, you say "that's how averages work".
So let's look at Africa. Their fertility rate is above replacement, but is dropping rapidly. We can measure how fast it is dropping. We know approximately when it will fall below replacement levels. And we don't see any reason why it should remain above them, when it didn't remain above replacement (or even just at) anywhere else in the world. It's natural, and even smart, to assume that the same sociological forces that made it drop elsewhere are those making it drop in Africa, and that they will work the same as elsewhere (since Africans are human like everyone else). It'd actually be sort of racist to assume that it would work differently there wouldn't it?
Once we have considered the places it's below replacement, and the places that it's above replacement but dropping, where else is left at all? Nowhere.
You don't even understand the phenomenon. You don't want to understand it. And you're claiming that somehow it's not even happening. It's bizarre.
Also even at a slightly below replacement rate (where the global fertility rate is heading indeed) it will take centuries
No. The effect actually picks up speed the longer it occurs. Children internalize norms. If the 5 children who see everyone around them childless (excepting their own parents who have one), then don't grow up to have one child also, they'll have on average 0.2 children or something like that. Each generation shrinks faster than the last.
And if that somehow still translates into "it will be centuries before the last centenarian dies!"... how is that a counter-argument at all?
It's bizarre that your theory is that we haven't run out of gas when the speedometer still says we're doing 100kph.
Soon for me is "anytime in the next 200 years". Soon for you is "next 2 minutes". We do not have the same "soon".
It wouldn't have to be average. All it has to do is nudge things below replacement.
And children who grow up in that world internalize it as a social norm. That becomes their ceiling for how many children to have someday. They then have the same number. Or fewer. The ones that go for "fewer" just nudged the rate down lower still. Iterate that through 30 generations, see what happens.
Depends on the "we". If by "we" you are excluding myself and my descendants, then you most certainly will.
If you are including me, then no. But the subset of humanity that is like yourself, you're goners. Along with most of your ideology.
I forgot. Only climate science is allowed to think long term. The one true science. Measured in human generations, any one of which lasts no longer than about 100 years, each generation staggered with the next, and with a growing sentiment that having children is wrong, dangerous, and unfashionable that we impress upon youth... you people have less than a couple hundred years. Someday, when it becomes impossible to ignore, those of you still alive will look back to times like now, when something might still have been done about it.