in a village people burn wood and cow dung as fuel for basic necessity in another nearby village people have a biogas plant in which bio waste is used to prepare biogas which is supplied to all house of the village if we compare both situation of The villages which practice is the best and why
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I think the biogas plant is best way,
because if we burn something for fuel it release gases that can be harmful for nature and humans but in the case of biogas it doesn't need to burn anything the energy is produced by the breakdown of organic Matter, not in the presence of oxygen.
like this the we can produce energy without any pollution.