Brazil's Sobradinho dam. The new study suggests that the water flows for Brazil's four largest power stations — Itaipu, Furnas, Sobradinho and Tucuruí — will decline from 38% to 57% by 2040, seriously reducing their energy output and forcing Brazil to rethink its reliance on hydropower. Photo by Glauco Umbelin licensed under the Creative Commons Attribution 2.0 Generic license
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