Change in the global climate is a major threat that the world is facing today. The nonrenewable energy con­sumption in the past has led to global warming that needs to be addressed (Bilen et al., 2008). The household digesters could reduce the pressure on the environment by dropping deforestation and GHG emissions followed by loss of cultivable land, and soil erosion (Gautam et al.,

2009) . Biogas production in rural areas can partly reduce global warming (Pei-dong et al., 2007). By using biogas in rural households economical, environmental, and so­cial benefits were achieved (Yang et al., 2011). Even though both carbon dioxide and methane are major con­tributors to the greenhouse effect, the global warming
effect of methane is 21 times greater than that of carbon dioxide (Dhingra et al., 2011). However, houses equip­ped with biogas systems exhibit leakage of gases in the biogas systems. Fortunately, the households with biogas plants have 48% less emissions compared to households without biogas systems (Pathak et al., 2009). It is worth talking about 10% of households, which had methane leakage (Yang et al., 2011). Research has already shown that by replacing firewood and coal with biogas, the emission of CO2 and SO2 would be reduced by 4193 thousand tons, and 62.0 thousand tons, respectively (Pei-dong et al., 2007).

CONCLUSION