I'm just recalling the stand up comedy routine of Sam Kinnison from way back when.  I think he was talking about Ethiopa...pointing out that these people continue to live in drought plagued areas.  "See this? [picks up sand]  Know what it will be in 50 years?  SAND!  MOVE TO WHERE THE FOOD IS!"
I dont think any amount of money you throw at Africa will help.  Better off saving the funds for you own domestic needs.  You're fighting a culture there that doesnt beleive in how to protect oneself from AIDs, etc etc.
I dont want to sound like I have no compassion for their plight.  But they've been in some sort of blight since , well, forever.
Let's pick a scenario we can make a difference in.