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In page Hydropower:
"Large and deep dam and reservoir plants cover large areas of land which causes greenhouse gas emissions from underwater rotting vegetation. Furthermore, although at lower levels than other renewable energy sources,[citation needed] it was found that hydropower produces methane equivalent to almost a billion tonnes of CO2 greenhouse gas a year.[5] This occurs when organic matters accumulate at the bottom of the reservoir because of the deoxygenation of water which triggers anaerobic digestion.[6]
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