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Answered 2008-05-07 15:41:07

Hydroelectric power is one of the most abundant and useful renewable sources of energy, but there are environmental impacts. A hydroelectric dam requires a reservoir of water behind it; the lake that is formed when the dam is put in place can flood otherwise useful land. Large dams also prevent fish from moving freely about the river, which can impact the ability of some species to spawn, such as salmon.

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