“Voices of the Forest” (Part 3 of eight) charts life in central Africa's Congo basin, “a vast green blanket,” says narrator Joe Morton, that's home to the Baka people (once called Pygmies), who have been living in villages for less than 40 years. But they still draw their sustenance from the forest. So, too, do loggers, and the Cameroonian Baka profiled here must send a delegation “to confront the outside world.” In Ghana, much of the forest is already gone, which makes it difficult for carpenter Annan Cedi to find wood for the “fantasy coffins” he fashions.