Question

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

Answer 1

Step 1: Sources of energy

Conventional sources of energy	Non-conventional sources of energy
These are non-renewable sources of energy, i.e., they cannot be replenished again and again.	These are renewable sources of energy, i.e., they can be replenished again and again.
These are mainly used for commercial and industrial purposes.	These are mainly used for domestic purposes.
Usage of these sources of energy leads to air pollution.	Usage of these sources of energy does not cause pollution and is eco-friendly.
Examples of these sources of energy are fossil fuels such as coal and petroleum.	Examples of these sources of energy are solar energy, biomass, wind energy, etc.

An illustrative tree diagram of the sources of energy is given below.

Step 2: Need for harnessing non-conventional sources of energy

1. The energy demands are rising as the population of the world is increasing every day. The conventional sources like coal and petroleum are limited and will exhaust in the future, which is why an alternate renewable resources are required.
2. The non-conventional sources of energy are required as they do not cause harm to our environment.
3. The non-conventional sources of energy are renewable i.e., they are inexhaustible.