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Heads of state from countries in West Africa have been meeting in Nigeria to discuss how to save Lake Chad from drying up. It's estimated that some 40 million people from Nigeria, Cameroon, Chad, Niger and Central African Republic rely on the lake for fresh water and other resources. But desertification and overuse have led to its' shrinking. So what is the solution? Nigeria's Minister of Water Resources is Sulaiman Adamu. (Image: Lake Chad. Credit: Getty Images)