For agriculture (Both crop and animal production) have contributed to the methane in the atmosphere is about 18 percent, mainly due to rice and livestock. Especially ruminant animals such as cattle, goats and sheep, which are methane emissions out over poultry and pigs. Since ruminants have a digestive system by fermentation in the stomach, known as the "Enteric fermentation" The methane is emitted around 15 percent of total methane emission in the atmosphere.