Question

what is biogas ?why it is called eco friendly fuel

Answer 1

A mixture of methane and carbon dioxide, produced by anaerobicdigestion of organic waste matter, used as a fuel

Answer 2

Biogas is mainly methane produced by breakdown of organic matter in the absence of oxygen.
Biogas is considered as environmentally friendly fuel.It ontains 60% methane and less carbon dioxide, so it doesn't contribute to greenhouse effects on the environment