He has just convinced me that up until right now I have been wrong about the effect of increased medical care in the poorest countries. I had been telling myself that the effect of improved healthcare, leading to lowered child mortality rates, would only work to increase the rate of world population growth even more. But in this talk he makes it clear, I think, that the effect of lowering child mortality in the poorest nations is actually to decrease the rate of growth, because - never mind what the actual mechanism is - clearly the data shows that once child mortality decreases, what always follows is that the average number of children people have drops, too.
See for yourself.
The role of the west is to become the foundation of the modern world. Nothing more, nothing less. But it's a very important role. Do it well and get used to it.