The fermentation or the anaerobic digestion of biodegradable materials produces this gas. It’s formed primarily by Methane and Carbon Dioxide.
There is another type of biogas named wood gas. It’s created by the process of gasification of wood. It’s composed mainly by Nitrogen, Hydrogen and Carbon Monoxide, and it has traces of Methane.
Hydrogen, Carbon Dioxide and Methane can be oxidized or combusted when exposed to Oxygen.
Depending on how it’s produced it may cause more or less pollution.
Biogas is usually used for heating purposes, such as cooking. It can also be used to power car engines.
What I think: There are probably other better choices to power car engines, but it’s better to use biogas than depending on fossil fuels like petroleum.
Sources:
http://en.wikipedia.org/wiki/Biogas
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