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(FILES) This file photo taken on September 22, 2016 shows boys from the Karo tribe sitting on branches of a tree in front of the Omo river in Ethiopia's southern Omo Valley region. Ethiopia on December 17, 2016 inaugurated a hydroelectric dam aiming to double the country's electricity output and advance the nation's ambitions as an exporter of renewable energy. The Gibe III dam, which reaches 243 metres (800 feet) in height, is the third-largest dam in African and the biggest in a series built along the Omo River. When it comes fully online, the Gibe III is expected to produce 1,870 megawatts of power, enough to sell energy abroad including to neighbouring Kenya. But environmentalists and rights groups warn the project will dramatically decrease water levels downstream all the way to Kenya's Lake Turkana, which derives 80 percent of its resources from the river. The lives of hundreds of thousands of people who make their living in the Omo River valley and on Turkana, both UNESCO World Heritage sites, would be affected, they say. / AFP PHOTO / CARL DE SOUZA