Which is one cost of using tides for energy?

A cost of using tides for energy is:

Alteration of tides in area.

Explanation:

Tides are a clean source of energy that can be very efficient and productive depending on the technology used to exploit them. However, the use of them will alter the rest of the tides in the area by making them vary and obtain different rhythms and courses. Therefore, people have to be very careful in the areas to exploit because they can exploit the environment forever.

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