Question

why there is a need to harness non-convential sources of energy ? give one main reason.

Answer 1

fossil fuels are very less.
increase in demand due to population growth.
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Answer 2

we need to harness non conventional sources of energy because of the following reason :
the conventional sources of energy are always not available in the world 
anytime it can get exhausted.

we need to conserve it in order to save it for the future generation.

examples of non conventional sources of energy are fossil fuel, crude oil etc......

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