Hydroelectric power’s reputation as a clean source of energy continues to take a pounding. The results of a 3-year study of rivers, lakes, and reservoirs in Southeast Asia which was published today in Taiwan found that hydropower is a greater contributor to global warming than power plants run on coal or oil. The researchers explained that the dead organic matter at the bottom of a reservoir behind a dam does not receive enough oxygen to decompose which results in the production of methane, a more powerful greenhouse gas than carbon dioxide by a factor of 21, and nitrous oxide, a more powerful greenhouse gas than carbon dioxide by a factor of 200. A member of the research team predicted that the Three Gorges Dam built on the Yangtze River in China, which is now in operation, will be a serious contributor to global warming. (Photo of Three Gorges reservoir behind the dam credited to Three Gorges Probe.)
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