“Sir” “Jonathon Porritt”, (….on…? Bit prissy, n’est-ce-pas?) described as an “adviser”, has apparently come out in the true colours of GreeNazis, and on the original 1960s paleophilosophic Rachel-Carson-Paul-Ehrlich-Hegelian battle-ground. This was human population, its supposed right size, its growth, and what should be done about it in the light of their belief that lots of humans is bad, and a few well-chosen ones is good.
The Landed Underclass integrates his own thoughts about why Greens and other antihuman-oids have these ideas about population levels, with the notion of what populations would become, for a polity, under different market conditions.
The Devil, also cited by Landed, has this. I tend to agree that people who advocate population levels of humans under those which currently exist, are deliberately wicked and evil killers.