list 2 ways animal dung used as fuel
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The animal dung is used as fuel when
(i) it is directly burnt to get energy.
(ii) it is converted into bio-gas and used as fuel.
The second method is pollution free, clean and more efficient as compared to the first one.
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It is a well-known fact that the cow dung is used as the major fuel resource in replacement for the gas stoves in many villages.
It is burnt directly for acquiring better energy.
Apart from that, the cow dung is converted into a bio-gas.
It is then used as a fuel.
It can be considered as a clean, efficient and free when compared with others.
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