Question

Why do we need to conserve coal and petroleum and not hydel​

Answer 1

Answer:

We need to conserve coal and petroleum because they are non renewable sources of energy and it takes millions of years for their formation. They are thus cannot be replenished quickly.

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Answer 2

Answer:

We need to conserve coal and petroleum because they are non renewable sources of energy and it takes millions of years for their formation. They are thus cannot be replenished quickly.

Hydel power uses the power of moving water to produce electricity. This can be done by building dam. Since it is a renewable source of energy, it is not required to conserve it.