The hydropower paradox: is this energy as clean as it seems?

New research finds that the world’s hydroelectric dams generate a surprising amount of greenhouse gas emissionsIn July, UN Secretary Ban Ki-Moon highlighted the role of hydropower in boosting the use of renewable energy globally, when he visited a nonprofit institute in China that helps emerging nations develop and build hydropower plants. Many countries consider hydroelectricity a clean source of power because it doesn’t involve burning dirty fossil fuels. But that’s far from