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methane is a green house gas.but we say bio-gas is an excellent fuel because 75% of it constitute methane. but thats not a problem to earth?
Biogas methane is methane created from biologically created organic matter.Fossil fuel derived methane is known as 'natural gas'. Natural gas comes from mineral reserves, where it has been stored in the ground since its formation from living plants and animals hundreds of thousands of years ago. Natural gas/methane also comes sometimes from coal mines and coal measures which emit it.So, in other words, biogas methane means 'green', 'renewable' methane, as opposed to natural gas which when burnt contributes to the green house effect.
Methanogens are organisms that make methane via a unique metabolic pathway with unique enzymes. This produces a mixture of gases, primarily methane and carbon dioxide.


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