As an agriculture-based country, Vietnam has great potential to develop biogas in the animal husbandry sector. Statistics show that every year, cattle and poultry herds in Vietnam discharge about 73 million tonnes of droppings. Each tonne of muck can cause 0.24 tonne of carbon dioxide (CO2) equivalent, which means 73 million tonnes of animal droppings will cause 17.52 million tonnes of CO2, seriously polluting the environment.