F150 Top speed
I love the Ford F150 super crew. It has a top speed limited to about 175 km/hr. That is not to say you should drive at 175 km/hr, it is just to say it can be done. So it is with human population. Some bright light somewhere will have a plan for a 20 million person Ontario. Doing that would be reckless, in the same way driving at 175km / hr is reckless and idiotic.
There are no rewards or punishments only consequences.
Many estimates for a maximum human population for the planet earth fall in the range of 4 billion to 16 billion persons.
Maximum is not the same as optimal. The well-known study of Daily (Ref 1) include sufficient wealth, access to resources, universal human rights, preservation of biodiversity and cultural diversity, and support for intellectual, artistic and technological creativity estimated the optimal population size in the vicinity of 1.5 – 2 billion people.
Another study estimated considering a comfortable consumption based on European living standard and a sustainable use of natural resources, suggesting only 2 billion people as appropriate size (Ref 2 and 3).
Some like Jordan Peterson would respond, “Then just leave; if you think we need that number kill yourself” And I suppose that level of stupidity is sometimes good in the moment to convince the already brain dead of your audacity and conviction of your own stupidity. However it ignores the simple fact that we need to plan. We need to think things through. Easy. No. Needed. Yes.
1: Daily, G. C., Ehrlich, A. H. & Ehrlich, P. R. Optimum human population size. Popul. Environ. A J. Interdiscip. Stud. 15, 469–475 (1994).
2: Pimentel, D., Harman, R., Pacenza, M., Pecarsky, J. & Pimentel, M. Pimentel, David, Natural Resources and an Optimum Human Population. Popul. Environ. 15, 347–369 (1994).
3: Pimentel, D. et al. Will Limited Land, Water, and Energy Control Human Population Numbers in the Future? Hum. Ecol. 38, 599–611 (2010).
For more reading on optimal population size
Economic Growth, it’s a drug too.