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Could Solar Lighting Be the Next Mobile Phone?

Between 2000 and 2010, the number of mobile phone subscriptions in developing countries increased from 215 million to 4.1 billion.  From a luxury for the rich, the mobile has become a ubiquitous presence in rural and urban areas alike, even in some of the most fragile countries in the world.  Afghanistan saw 38 subscriptions per 100 people in 2010, an average of more than one phone per household.  And while ubiquity in Afghanistan is evidence enough that mobile phone access hardly guarantees quality of life or sustainable development, mobiles have proven themselves powerful tools to improve