Are dams helpful or harmful

Although most dams are built with the intention of creating hydro-electric power, which is a cheap and effective way of generating power without burning fossil fuels, or using nuclear power, they do often entail a major change in the local habitat, including moving complete villages or settlements.

In one instance, when a large dam was built in Egypt, they had to move a series of statues that had stood on place since the times of Rameses.

Dams may also kill fish or stop them from migrating to where they were born.