One doomsayer reviews another and finds a bright side? See the current New York Review of Books. Paul ("The Rise and Fall of Great Powers") Kennedy says Robert D. Kaplan's "The Ends of the Earth" generalizes on the basis of a "Doomster's Journey" to the most troubled lands. Kennedy maps an alternative "Cornucopian's Journey" to "model democracy" Costa Rica, prosperous Botswana, India's software-producing Bangalore, and beyond. Both journeys are part of a developing-world saga the rest of us should know.