Reservoirs are a major source of global greenhouse gases, scientists say - The Washington Post: "The research, said Deemer, complicates the idea that hydropower is a carbon-neutral source of energy, although she stresses that the authors aren’t saying that they’re against using large bodies of water to generate energy through dams. Rather, they’re arguing that the greenhouse gas calculus has to be included in evaluating such projects.
This problem is not an entirely new one: A major 2000 study in BioScience raised this issue, and the International Hydropower Association on its website acknowledges that “While hydropower is a very low-carbon technology, it is known that some reservoirs in certain conditions can release quantities of methane, a greenhouse gas. Reservoirs can also, in other circumstances, act as carbon sinks.”"
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