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A man shows a recycled plastic bottle inside a corrugated iron roof house at Granizal neighborhood in Bello municipality, Antioquia, Colombia on November 21, 2014. The foundation "A Liter of Light" aims at improving the quality of life of families which have been displaced from their land due to the armed conflict, through lighting their homes with alternative energy. Recycled plastic bottles filled with water and chlorine are placed across the corrugated iron roofs so that they illuminate the inside when there is daylight. For public lighting there are solar panels held up by wooden posts, which retain energy during the day and have a batteries and 5-watt LED bulbs covered by plastic bottles which work as a diffusers. AFP PHOTO/Raul ARBOLEDARAUL ARBOLEDA/AFP/Getty Images

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