why have big dams become obsolete
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These obsolete dam removals marked the beginning of what has become the largest landscape-scale river restoration ...
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Big dams have become obsolete because they can cause earthquakes They tend to release greenhouse gases because of the rotting of flooded vegetation, They also tend to destroy marine fisheries as they disturb river-borne flows of fresh water and nutrients into the oceans.
Explanation:
Big dams have often caused controversy due to their widespread impact on local communities The flood areas have changed the river ecosystems and caused heavy geologic hazards .
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