In this Nov. 2, 2012 photo, young men walk in the wadi alongside Louri village, in the Mao region of Chad. Climate change has meant that the normally once-a-decade droughts are now coming every few years, decimating food production. (AP Photo/Rebecca Blackwell)

Associated Press
In this Nov. 2, 2012 photo, young men walk in the wadi alongside Louri village, in the Mao region of Chad. Climate change has meant that the normally once-a-decade droughts are now coming every few years, decimating food production. (AP Photo/Rebecca Blackwell)
In this Nov. 2, 2012 photo, young men walk in the wadi alongside Louri village, in the Mao region of Chad. Climate change has meant that the normally once-a-decade droughts are now coming every few years, decimating food production. (AP Photo/Rebecca Blackwell)
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