Well, building dams costs a lot of money and uses a lot of material. Also, dams can negatively affect the immediate environment through flooding, displacing native animals, etc.
The rivers beyond the dams can become shallow and kill off much of the life living in them. The reservoir created behind the dam can kill plant life, and it destroys the animal’s habitat. Power lines have to go through more habitat, use up extensive amounts of copper, and require workers with their equipment to come in and lay it all out. Also, the huge reservoir serves as a breeding ground for insects.
The reservoir built behind the damn kills much of the aquatic life that existed there before. Additionally, the water pressure beyond the damn is extremely low. Animals may also get stuck inside the hydropower damn and killed in the process.
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