No. The major drawbacks to hydroelectric power are dams’ effect on river ecosystems, and the fact that towns may have to be flooded in order to build reservoirs.
Technically, yes they do. While during their power generation they do not release carbon dioxide, they do emit CO2 in their creation. Hydroelectric power plants cause huge amounts of CO2 to be emitted through their construction. Dams are made of concrete, one of the most carbon intensive building materials, and large amounts of CO2 are emitted in transporting the building materials. Also, methane, a greenhouse gas 25 times more potent than CO2, is emitted when the area is flooded and plant material breaks down while underwater.
“The main factor which drives the CO2 and CH4 production in a hydroelectric reservoir is the decomposition of organicmatter on the bottom. The organic matter originates from the flooded area, the primaryproduction in the reservoir and from the river upstream. The different pathways the gasesreach the atmosphere are by diffusing and bubbling in the reservoir itself and in the riverdownstream. A huge amount of gases is also released when the water is passing the turbineand the spillway. Methanotrophy can be an important sink for CH4 reduction. A comparisonwith thermo-power plants shows that in some cases greenhouse gas emissions fromhydroelectric reservoirs are even higher than the ones from thermo-power plants.”
Click here to cancel reply.
Sorry,At this time user registration is disabled. We will open registration soon!
Don't have an account? Click Here to Signup
© Copyright GreenAnswers.com LLC