Biological methanation

Biological methanation is like making a big potty for tiny living things called microorganisms. These microorganisms eat stuff like manure or food waste, and then poop out a gas called methane. Methane is used for things like cooking or heating your house. But don't worry, the microorganisms don't create any bad smells because they live in a big container that has air pumped in and out to keep things fresh. Some people like biological methanation because it's a way to recycle waste and make something useful out of it.