In other words, the problem is solved. Any gargantuan efforts that we apply now are just about trying to get there a decade or two faster. Given the history of worldwide coordination attempts, it's not clear that it is possible or worth it.
1. Every nation with a declining birth rate is shitting their pants about it and trying to raise the birth rate. It is seen as an existential crisis to not grow in population.
2. Birth rates have already been dropping for decades and carbon emissions are continuing to climb because we keep finding new ways to spend money on creating carbon emissions.
"One country that has seen a steep rise in its fertility rate is the Czech Republic."
https://www.theatlantic.com/family/archive/2021/07/improve-u...
EPA press release said emissions were decreasing under Trump.
https://www.epa.gov/newsreleases/greenhouse-gas-emissions-co...
Except population is exploding in Asia and Africa and western nations are intent on importing as many of those people as possible.
What’s baffling to me is how much overlap there is between the “we need to reduce CO2 emissions”, “having children is selfish”, and “we need more immigration” crowds. One of these things is not like the other.
Alarmism is a good way of moving people to action but it isn't accurate.