Given the incompetence to African political leadership (with the exception of a few countries), I wouldn't be surprised that the African continent loses 25-45% of its population by 2050. It would appear that Malthus is right--but then it was human folly that did this, not forces of nature as Malthus surmised.
And the liberals will cry out (while tearing at their hair) about how it is all America's fault (through inaction); the newspapers will inundate us with stories about how women, children, and the poor were hit hardest; and the UN will make ever-increasing demands for our hard-earned money so that they can use it to "fix" the problem (by giving it the tyrants who caused the starvation in the first place).