Question

Why is their need to harness non-conventional sources of energy? Give two main reasons. 

Or 

We are looking for alternative or non-conventional sources of energy. State three reasons for it.

Answer 1

The two main reasons to harness non-conventional sources of energy are: 

(i) As, fossil fuels like coal, petroleum, are present in a limited amount which and are likely to finish one day so the need for alternative sources of energy is essential. 

(ii) Use of conventional sources of energy (coal, petroleum etc.)