It's difficult to imagine saving lives without saving the environment, especially when dealing with desertification, for instance.
Africa is a big continent, and different countries have VERY different ways of living, and even resources, political systems, cultural and ethnic issues, etc.
One thing is that our subsidized Western agricultures have really hurt this continent for quite a few decades, and I think that trading with partners that are not their equal did bring harm.
Add corruption in the wake of colonization, the strategical interests in the cold war, and yes , go search on how multinationals brought their grain of salt in impoverishing a continent brimming with natural resources. Check out IMF, western (an now Asian) trade partners and governments, and you'll see how intricate the situation is.