RURAL SOLUTIONS - Biogas in Kenya

Rural Solutions is a video series that highlights solutions to specific challenges that are common in rural areas of developing countries. Biogas provides an environmentally-friendly alternative to power rural households - but biogas digesters are costly to set up, especially in remote areas. Here is a solution to this from Kenya.
Produced by: The International Fund for Agricultural Development (IFAD)

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Nice and simple design. Burns the methane produced and the byproduct is CO2 and water but it's not pollution just part of the carbon cycle ! Why not use Human waste ? I think they do that in China.