Americans and others living in the developed world would be expected to give up a lot of their prosperous lifestyle so that the wealth that makes it possible could be diverted to the Third World.
Somehow, he thinks we should live a third-world lifestyle to conserve wealth to divert to the actual Third World, while at the same time maintaining First World levels of productivity to generate that excess wealth.
Fiefdoms... Somehow, they've got us divided into fiefdoms - thus the push toward "sustainability".