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

There is a need to harness non-conventional sources of energy due to the following two reasons:

1. They are in-exhaustible and present in nature in enough amount and can’t be replenished as compared with conventional sources of energy which once replenished, can’t be reproduced again for thousands of years.

2. Non-conventional sources of energy are environmental friendly. They don’t create any kind of pollution. Therefore, there will be no harm to mankind and environment from use of non-conventional sources of energy.