I think Bilby means that population increase BY ITSELF is not a problem, since our best current projections predict population growth is scheduled to level off later this century and then decline (and decline has its own problems, as Japan is finding out). The problems lie elsewhere.
We have been over this many times in this thread. Yes, the UN says population will level off at about 130% of the current population, and perhaps even start to decline.
The problem is that we are already in overshoot. The Global Footprint Network calculates that it would take 1.75 planets to sustainably support us. We continue on, but the overshoot is rapidly deteriorating our planet.
If future population rises 30%, and our average footprint per person remains the same, we end up needing 2.25 planets to support us all. If affluence also increases in that timeframe we could easily get to the point of needing 3 planets.
That is going the wrong way. As I suggest in my paper, we should instead be reducing our impact in half.
Some people here say that it is OK that we will have 30% more people at increasing levels of affluence. Science will save us. We will use all kinds of existing and new technologies to reduce our negative impact per unit of consumption. Thus, even with 30% more people at higher consumption per person, we will reduce the negative impact per unit of consumption such that one planet is sufficient.
But science is rapidly falling behind. So how are these people so certain that science will stop falling behind, that some day we will actually use science to reduce our impact enough that our increasing consumption does not matter? They don't know this. As far as I can tell, they just take it by faith that science will do this.
Like I said many times, this reminds me of the prophet Habakuk.The Old Testament prophets promised over and over that obeying Yahweh would lead to a prosperous kingdom of Israel on Earth. One would think that the repeated failures of this religion would have caused people to reject it. But the religion hung on. Many followed the advice of Habukkuk 3:17-19. That passage says that, in spite of the promises that Yahweh will cause them to have olives, fruit and meat in abundance, and even if it doesn't happen, they will still believe that it will happen. They will simply have blind faith that their God will pull through, in spite of all the evidence to the contrary.
I see that some people here have the same blind faith to nuclear power, carbon capture, and other technologies. Although they have not fulfilled their promise, yet we will have faith that they will do so in the future.
And what if technology doesn't pull through to the extent we need? Well, technology is their Plan A. If Plan A fails? Then plan B is to try plan A again. If Plan A fails again? Once again Plan B is to go back to Plan A. Ad infinitum. That is blind faith. That is religion.
I have asked people that appear to me to have this undying faith in technology what they would do if technology failed to save the day. If it became obvious that the only way to prevent completely trashing the planet was to either take steps to reduce the number of future people making footprints, or limit the size of the footprint per person, which would they think is better? They refuse to answer. I have asked the question several ways. They refuse to answer. They have Plan A. They keep telling me it makes no sense to ask what they would do if Plan A fails. Plan A will not fail. They want Plan A to work. They need Plan A to work. They have blind faith that Plan A will work. So don't ask them what they will do if Plan A does not work. They equate that to the nonsense of asking somebody if he stopped beating his wife yet.
I might expect the same answer if I asked true believers what they would do if I showed that Jesus did not rise from the dead. What? They have faith that Jesus rose from the dead. There is no need to ask them what they would do if he did not rise from the dead. That is like asking them if they have stopped beating their wife yet. The question makes no sense.
But the question of what you would do if I could show Jesus did not rise from the dead, or what you would do if we needed to cut consumption to save the planet, are real questions. Those who do not have undying faith that they cannot possibly be wrong would be willing to answer what they would do if they were shown to be wrong. But true believers in the resurrection or Nuclear Power don't want to answer the question of what they would do if their faith is wrong.
In my paper --
https://mindsetfree.blog/we-are-overloading-the-planet-now-what/ -- I try to present not only my view, but answer the objections of those who disagree. And I am here to discuss the objections I might find here.
Does that answer your post?