I can think of only one, and it's rather drastic, let's recolonise parts of the damn place, with force if needed. Birthrates are too high it can never be sustainable, but we can hardly let them starve either. We have the expertise to make sure there is enough food, and the military capacity to ensure the stability. In a period of 30 years we can build it up the and teach them how to do it themselves, after that we leave. We would be taking away their freedom and dignity, but in the long term we would help them. Africa will not improve when left to their own devices