Answer:
The
four reasons for replacing it with alternate sources of energy are
(i) Wood has low calorific value as compared to other sources of fuel.
(ii) It causes air pollution on burning.
(iii) Cutting down of trees causes depletion of forest - leading
to imbalance in nature.
(iv) Only 8-10% energy of burning firewood is utilised and
the remaining is wasted. (1/2x4)
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