Noah Millman responds to Martin Walker's article on global demographics:

I think the situation in sub-Saharan Africa is about as awful as can be imagined. This is already a region with extremely high infant and adult mortality rates relative to the global average. If fertility trends do not change radically in a short time – and there’s little reason to expect them to – Africa is going to way overshoot its carrying capacity, and face a Malthusian catastrophe the likes of which the world has never seen.