Population growth is a solved problem as countries become wealthier. If you want to reduce population quickly, perhaps look at reducing the number of elderly people or reducing their economic dead weight cost (encourage euthanasia, export to cheaper countries, deathly games or sports, encourage pandemics, encourage depression, early payout for future euthanasia, et cetera). This could also solve the housing crisis (and housing is a driver for economic growth, and growth is really the main driver for global harm).
Direct costs for the elderly are currently ~40% of government expenditures in New Zealand and growing.
My guesstimate 23G$ ($==NZD in this comment) for superannuation/pension[1] and 16G$ healthcare costs[2] of 110G$ total expenditure for ~16% of population (789k of 5M in 2020, projected to 20% in 2030, and 25%+ eventually[3]).
That is ~60k$ per person. 50% of people retiring now can expect[4] to live 2 decades i.e. cost ~1M$ (totally ignoring discount value!).
> feasible to have children (through surrogate) at the age of 50
If you think it is okay to orphan 1 in 20 children, and that children don't have live grand parents, although maybe benefits of help with elderly care and passing on inheritance? 65 year old helping 90 year old is challenging and very common).
That would definitely reduce population (2 children per 2 adults reproducing at 50 has maybe 40% less total population count, compared against population count if reproducing at 25).
Direct costs for the elderly are currently ~40% of government expenditures in New Zealand and growing.
My guesstimate 23G$ ($==NZD in this comment) for superannuation/pension[1] and 16G$ healthcare costs[2] of 110G$ total expenditure for ~16% of population (789k of 5M in 2020, projected to 20% in 2030, and 25%+ eventually[3]).
That is ~60k$ per person. 50% of people retiring now can expect[4] to live 2 decades i.e. cost ~1M$ (totally ignoring discount value!).
Disclaimer: tongue in cheek: I am middle aged.
[1] https://www.interest.co.nz/news/100033/budget-2019-social-we...
[2] https://i.stuff.co.nz/national/politics/125200191/hey-big-sp...
[3] https://www.stats.govt.nz/information-releases/national-popu...
[4] https://www.stats.govt.nz/tools/how-long-will-i-live
Edit:
> feasible to have children (through surrogate) at the age of 50
If you think it is okay to orphan 1 in 20 children, and that children don't have live grand parents, although maybe benefits of help with elderly care and passing on inheritance? 65 year old helping 90 year old is challenging and very common).
That would definitely reduce population (2 children per 2 adults reproducing at 50 has maybe 40% less total population count, compared against population count if reproducing at 25).