Indeed. If you really wanted to implement effective green policies, they would involve reducing the global population to around half a billion max and keeping them at pre-industrial levels of technological development.

No, straight up, that's what needs to be done. I think that the current population-management fantasy supported by the WEF and quite a few on Hackernews -- building enormous arcologies in which to warehouse much of the world's citizenry -- is going to run into technical challenges that threaten the entire project, before they even get to the massive "people hate living there" problems.

We can get to actually zero carbon emissions if we adopt simple living without any industrial technology, but we lose the capacity to feed eight billion people without Green Revolution style agtech, so we will have to make do with fewer people. We have to face up to the reality that industrial civilization is widely regarded, by people with deep understanding of the issues, as a bad move.