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It has always been thought that the construction of dams and reservoirs would help in the conservation of one of the most essential resources of life on the Earth, water. But a recent study has found out that the same dams and reservoirs are responsible for bringing in an increase in the level of global warming or even being one of the primary causes of global warming.They have been found to emit greenhouse gases like methane which is supposedly 25 times more capable of gulping in heat than carbon dioxide. The activity of water being drawn up and down becomes the main reason of being responsible of emitting greenhouse gases, The study was conducted by the researchers in the Washington State University Vancouver studied thoroughly the Lacamas lake in Clark County, and after observing the water columns there, found that the dissolved gases would be released and the amount of methane 20 times when the water would be drawn down.The lake mud had some bubbles rising and they found that when the mud would face a drawing down the release of methane would be increasing by 36 times! This would certainly arouse the concern of the people associated with the cause of conserving the nature and control the emission of green house gases. Source