Yes the issue of decreasing won’t go away so what do people envisage when they say we can’t decrease
Nobody is saying that we can’t decrease. We ARE going to decrease in the UK. That has been inevitable ever since the birth rate dropped below 2.1 kids each. The actual decrease will start in 2025. The question is how are we going to manage the effects of this? How far we are going to decrease? Can we slow the decrease, and can we halt the decrease at some point? In order to halt the decrease, we will have to get the birth rate back up to about 2 kids each somehow. It’s currently at 1.6 kids and still falling.
Birth rates are below 2 kids in every European country, so immigration for Europe only exacerbates the decline in other countries.
Birth rates are falling in every country around the world. No country has successfully reversed a declining birth rate as yet, despite really trying hard. Even globally, we are at about 2.3 kids, so right on the brink of breaking even. When girls are educated and have access to contraception they limit their families, so unless we are willing to prevent poor women in various African countries from having those things then the global rate will certainly fall below 2.1, probably in around 2050. At that point global population decrease will be inevitable and as a species it will be the same question of how will we manage the effects and can we slow or halt the decrease.
Nobody is advocating for a perpetual increasing population. That’s not desirable or probably even possible at this stage.
Ideally we would decrease a bit, change our behaviour to benefit the planet, and then halt the decrease at some point and have a stable human population that is neither increasing or decreasing. But that requires 2 kids each.