02 Aug '11, 3am

New Findings on Hydro Power Could Shake up Renewable Policy

New Findings on Hydro Power Could Shake up Renewable Policy

Hydroelectric power has long been left out of renewable energy counts, on the assumption that it creates some greenhouse gas emissions as vegetation caught in damned rivers rots. But that may be about to change, with the results of new research just published by Dr. Jonathan Cole in Nature Geoscience finding that hydroelectric power reservoirs are responsible for only about a sixth of the carbon dioxide and methane previously attributed to them. An international team of scientists has amassed the largest data set to date on greenhouse gas emissions from hydroelectric reservoirs. The new analysis of 85 globally-distributed hydroelectric reservoirs revealed that these systems emit only 48 million metric tons of carbon annually, much lower than the earlier estimates of 321 million metric tons. In addition, most of the emissions only occur when reservoirs are newly built, as c...

Full article: http://cleantechnica.com/2011/08/01/new-findings-on-hydro...

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