Methane (CH4) is a colorless and odorless gas with a strong smell that occurs naturally in the atmosphere. Methane is an important greenhouse gas, as it traps heat in the atmosphere by trapping infrared radiation.

However, methane has been heavily regulated for decades due to its high global warming potential. It is primarily emitted from livestock and other farm animals as part of their normal metabolisms.

All cows, pigs, sheep, and goats produce methane through their digestive process as part of their metabolism.