Mitigation of greenhouse gases

A method of reducing the greenhouse gas impact of livestock farming, the method including

• feeding a fuel gas comprising one or more hydrocarbons to an anode of a solid oxide fuel cell stack;
• withdrawing air, that includes methane originating from livestock, from a livestock housing or enclosure and feeding the withdrawn air to a cathode of the solid oxide fuel cell stack;
• allowing oxygen in the air exothermically to react with the one or more hydrocarbons in the fuel gas to form at the anode a heated first exhaust stream comprising water and carbon dioxide, and at the cathode a heated second exhaust stream comprising methane, thereby generating an electrical current from the solid oxide fuel cell stack through an external electrical circuit;
• and
• feeding at least the heated second exhaust stream to a combustor and combusting the heated second exhaust stream in the combustor, producing a heated tail gas stream.