The sun fades fast on a small village surrounding the outskirts of Ouagadougou, Burkina Faso's capital city. Shadows fall in long dark lines across a neat row of houses. A group of school children race through the alleyways on their way home, clutching their school books.
Outside one of the houses, Mariama Mamane sits on the ground in the dust, huddled over a blue generator. The 29-year-old environmental engineer is attaching a large blue square bag containing biogas to a generator with a long tube.
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