> Halving the population in 50 years is not a realistic plan.

Here are some projections to support that statement. Supposedly 2084 is peak population.

https://population.gov.au/sites/population.gov.au/files/2025...

I haven't read up on all the assumptions made for those projections. If something unassumed pops up that makes things substantially worse then the population peak would come earlier I guess. But that's a gamble.