In East Africa, a humanitarian disaster is fast unfolding. The worst drought in 60 years means that crops have failed and livestock have perished. Poverty, climate change, and rising grain prices are combining to endanger a population already vulnerable to malnutrition and hunger-related diseases. More than 10 million people are affected across areas of Somalia, Ethiopia, Kenya, and Uganda. Multitudes are on the move, leaving their homes and walking hundreds of miles to seek food and medicine in temporary feeding stations. Just last month, Islamic militants broke up camps at the Somali-Kenyan border, forcing tens of thousands to flee back into starvation. News reports describe mothers having to choose between buying medicine for their weake...