Africa is once more plagued by malaria, and an international debate rages over the remedy. Some dream of a vaccine, others urge a return to DDT. In Kenya, scientists have found creative answers hiding in plain sight.
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.