Anaerobicdecay occurs when bacteria and fungi break down dead matter without oxygen. This can happen naturally in some soils, particularly water logged soils, and in lakes and marshes. When people overwater their houseplants and flood the roots, anaerobic decay can occur, which can kill them.
We can use the process of anaerobic decay or decomposition to provide us with fuel. Together the methane and carbon dioxide produced are called biogas. This is a source of renewable energy. Biogas generators are large vessels in which animal waste or specially grown crops such as maize are allowed to anaerobically digest. If domestic waste is used as a source of methane, this also reduces the volume of domestic waste added to landfill sites.