Anaerobic digestion

Finally something useful from what comes out of the back end of a pig.

Video

Anaerobic digestion – a process where microorganisms break down organic material in the absence of any oxygen to produce a methane and carbon dioxide-rich biogas. This can be burnt to produce energy, with none of the harmful effects of fossil fuels. And what's more, the nutrient-rich solids left after digestion can be handily used as a fertiliser!