Biogas
Asia-Pacific Economic Cooperation (APEC)

European Commission - Eurostat
Biogas is a gas composed principally of methane and carbon dioxide produced by anaerobic digestion of biomass. It comprises landfill gas, sewage sludge gas and other biogases such as biogas produced from the anaerobic fermentation of animal slurries and of wastes in abattoirs, breweries and agro-food industries.

International Energy Agency (IEA)
A gas composed principally of methane and carbon dioxide produced by anaerobic digestion of biomass.
It is measured on the basis of the heat content (net calorific value) of biogases used as fuel.

Latin American Energy Organization (OLADE)
This gas, primarily methane, is obtained from the anaerobic fermentation of biomass wastes.

United Nations Economic Commission for Europe (UNECE)
A gas composed principally of methane and carbon dioxide produced by anaerobic digestion of biomass.
It is measured on the basis of the heat content (net calorific value) of biogases used as fuel.

UNSD Energy Statistics Section
By-product of the fermentation of biomass, principally animal wastes, by bacteria. It consists mainly of methane gas and carbon dioxide.

UNSD Energy Statistics Section
Refers to dung and other non-dried excreta of cattle, horses, pigs, poultry, and the like and, in principle, humans when it is converted to methane by methods of fermentation or decomposition.