Energy resources can be classified into:
1. Conventional Sources of Energy- These are the energy sources that have been used for a long time. They are usually non-renewable sources of energy. For example, coal and firewood.
2. Non-conventional Sources of Energy- These are the energy sources that are renewable and not as widely used as conventional sources. For example, solar energy and wind energy.
Conventional sources are limited in supply and are usually harmful to the environment while non-conventional sources are renewable in nature. It is suggested to shift to non-conventional sources because they are necessary for sustainable development.
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