Throughout the book, adopt a sotto voice, in conspiracy with the reader, and a sad I-expected-so-much tone. Establish early on that your liberalism is impeccable, and mention near the beginning how much you love Africa, how you fell in love with the place and can’t live without her. Africa is the only continent you can love — take advantage of this. If you are a man, thrust yourself into her warm virgin forests. If you are a woman, treat Africa as a man who wears a bush jacket and disappears off into the sunset. Africa is to be pitied, worshipped or dominated. Whichever angle you take, be sure to leave the strong impression that without your intervention and your important book, Africa is doomed.
Do go read the whole thing, it's absolutely brilliant!