Humanitarian agencies are calling for full funding of the U.N.'s $7 billion appeal for the Horn of Africa during a pledging conference this week, citing a growing crisis and the need for urgent lifesaving intervention. The U.N. says the region is facing the worst drought in 40 years, with more than 43.3 million people in need of assistance in Somalia, Ethiopia and Kenya, and more than half of those lacking access to sufficient food, according to the U.N. The International Rescue Committee said t