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Bio gas is known as pollution free gas , but 75%of methane is presnt in in bio gas . methane is called green hosugas also. then my question is why bio gas

is called a pollution free gas?


It is really a good question
the first reason is that it contains only methane which is a greenhouse gas and noo other green house gas
second is that methane is unable to cause pollution com-pared to carbondioxide
hence it is pollution free

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