Ethiopia’s plans to build Africa’s largest hydroelectric dam on the Nile have sparked tensions with Egypt, which depends on the river to irrigate its arid land. But after years of tensions, an international agreement to share the Nile’s waters may be in sight. For thousands of years, Egyptians have depended on the waters of the Nile flowing out of the Ethiopian highlands and central Africa. It is the world’s longest river, passing through 11 countries, but without its waters the most downstream of those nations, Egypt, is a barren desert. So when, in 2011, Ethiopia began to build a giant hydroelectric dam across the river’s largest tributary, the Blue Nile, it looked like Egypt might carry out its long-standing threat to go to war to protect its lifeline. But last weekend, all appeared to change. Ministers from Egypt, Ethiopia, and Sudan agreed on the basis for a deal for […]