Think of Europe and what comes to mind is the soaring euro and gleaming cosmopolitan cities. But in the remote hills of Transylvania, a nearly medieval way of life prevails. Can it survive its encounter with modernity?
The world's billion and a half poorest people -- the quarter of humanity malnourished to the point of brain damage and deformity -- are mostly rural and live on mostly arid lands. Global warming will increase the stock of such lands, especially in Africa.