Africa is projected to grow rapidly in population until the end of the century. If developed countries can assimilate large numbers of African immigrants peacefully and productively, that could represent a path forward for the planet.

India's population also continues to explode. We've been very successful assimilating Indian immigrants in the US.

This blog post is a great read on the importance of institutions and how assimilation has succeeded with past immigrant waves: https://anowrasteh.substack.com/p/review-of-the-culture-tran... The tl;dr is that in principle, it's possible to imagine a South Korea in the year 2100 which is 80% descended from African immigrants and functions more or less the same way it does today. The immigrants just have to come at a slow enough rate that they adopt to the local way of doing things instead of overwhelming it. Probably would work best with a points-based immigration system similar to what Canada has. Also getting the host country to accept the new arrivals would also be an important challenge. In my opinion, more countries should follow France's lead and establish a foreign legion, so even right-wingers have to acknowledge that immigrants are helping the country out.