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Why is there a need to harness non-conve...

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

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(i) The energy demands are increasing rapidly due to : (a) population explosion (b) our efforts in improve the quality of life by adopting faster means of transport and travel, rapid industrialisation and extensive use of energy-fed home appliances.
(ii) Fossil fuels (coal, petroleum, `LPG`, Natural gas) are fast depleting.
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