A hydroelectric plant in Ethiopia. The country hopes to harness the waters of the Blue Nile to export hydropower and to irrigate crops.
Dawit Nida
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Wildlife biologist Anthony Fischbach observes a tagged walrus near Point Lay, Alaska, earlier this month. Tens of thousands of walruses have come ashore in northwest Alaska because the sea ice they normally rest on has melted.
U.S. Geological Survey/AP
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