Preschool teacher Iris Mejías uses biogas to cook food, which gives her autonomy, saves money and improves the quality of life in her home in the south of the Cuban capital. CREDIT: Jorge Luis Baños / IPS

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Preschool teacher Iris Mejías uses biogas to cook food, which gives her autonomy, saves money and improves the quality of life in her home in the south of the Cuban capital. CREDIT: Jorge Luis Baños / IPS