DAMS are NOT CLEAN
Despite what the government and SSE say, hydroelectric dams are not clean, eco gifts friends of the climate. The plantlife they submerge decays without oxygen, so it gives off methane. For several years after the land is flooded all the immersed vegetation gives off a huge pulse of methane. Even after it subsides, methane production continues as seasonal drops in reservoir levels allow plants to grow which later get submerged. This is serious stuff - methane’s impact on the green friendly giftshouse effect is more than 20 times that of CO2.
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