Biogas systems rely on the natural interaction between microorganisms and organic wastes – such as manure, sewage, agricultural by-products, and discarded food – to produce a clean and energy-efficient burnable gas. The gas is distributed through a network of pipes and is used for cooking and heating. This is done in the same way that many of us use natural gas from our local utility provider. With the simple strike of a match and turn of a knob, a family has a safe gas stove courtesy of their friendly neighbourhood microorganisms.