I zeroed in on exactly the same paragraph, "hydroelectric dams produce significant levels of carbon dioxide and methane because up to 28 percent of all artificial greenhouse gas emissions could be from rotting vegetation in dams." This idea does not pass the reasonability test. The dam does not create the vegetation. Some of it may die and rot due to the construction of the dam, but it would have died sooner or later. There may be a short term and minor spike in the CO2, but I imagine it's nothing compared to the slash and burn clear cutting going on in South America and other third world areas for other reasons besides hydro dams.
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