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State two advantages and two disadvantages of using hydro-energy for producing electricity. 

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Advantages: 

(i) When the electricity is generated, no greenhouse gases are made. 

(ii) It is an inexhaustible source of energy. 

Disadvantages: 

(i) The dam is expensive to build. 

(ii) By building a dam, the nearby area has to be flooded and this could affect nearby wildlife and Plants.

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