Vietnam is facing serious climate change impacts, mainly due to increased greenhouse gas emissions from organic waste. Converting biomass into energy can help reduce these emissions. Biogas technology, known as the "brown revolution," is widely used in warm climates like Vietnam. Biogas digesters are affordable, easy to build, and can use widely available materials to produce energy for cooking, lighting, and more. This technology is beneficial for developing countries, bringing convenience and cleaner energy to rural areas.