LOL.
I clearly expressed an opinion. It was an honest one.
Of course the future can only be projected, but we can be compelled by the methodology.
"I used to be rather concerned about overpopulation" - I used to be more expecting/scared of the exponential growth numbers, and it used to be such a concern to the point if I ever have children it would have been a major consideration.
I am still concerned about overpopulation, but much less so, and would likely give the number of children I had less concern because I do see the economic argument that countries like ours with a rate below 2.1 could see all sorts of problems with an ageing population.
I believe technology may help out with the burden of an aging population, but by the same token, I believe mass scale carbon extraction from air and other technologies will help with climate change. I believe technology will solve most of our problems in time, but not with enough confidence that we shouldn't take reasonable steps until these potential solutions are proven.
I'm glad you looked into my numbers and confirmed for yourself that I hadn't just made them up. That's your style, must have been quite a disappointment for you.
Here's another study to prove you wrong that there is only the one study (though I must admit, I read lots of articles that in hindsight were probably using the same data, but still seemingly well researched enough to compel me of the case)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4255510/