If there's somebody living in a fantasy world here, it is you. You who think that it is perfectly all right for poor people to starve to death while you indulge in your pasta. You who think that the African people don't deserve a good life as much you do. You who think that in the name of a finite world the poor could die while the rich could continue to enjoy life.
Hell, I'm even fantasizing about moving to Zimbabwe to build a signature campaign HQ castle for Christ's sake, so you know I'm in Africa's corner. The only problem with famine hitting Africa harder than the rest of the world would be some of the governments. IIRC, it was those governments that facilitated the famine that hit parts of Africa in the 1980s (remember USA For Africa? Probably not, but look it up.), not necessarily the people being unable to farm.
But that's always the case, and it'd be true for the US, Europe, and other places as well should there be a food crisis. People would be at their government's mercy if they tried to produce their own food. I'm hoping this is all just unrealistic fear, but I'm not saying it never could or won't happen in the near future.