In this Nov. 1, 2012 photo, 7-year-old Achta, right, walks with her mother Fatme Ousmane in the village of Louri in the Mao region of Chad. Achta's birth seven years ago coincided with the first major drought to hit the Sahel this decade. Climate change has meant that the normally once-a-decade droughts are now coming every few years. The droughts decimated her family's herd. With each dead animal, they ate less. (AP Photo/Rebecca Blackwell)

Associated Press
In this Nov. 1, 2012 photo, 7-year-old Achta, right, walks with her mother Fatme Ousmane in the village of Louri in the Mao region of Chad. Achta's birth seven years ago coincided with the first major drought to hit the Sahel this decade. Climate change has meant that the normally once-a-decade droughts are now coming every few years. The droughts decimated her family's herd. With each dead animal, they ate less. (AP Photo/Rebecca Blackwell)
In this Nov. 1, 2012 photo, 7-year-old Achta, right, walks with her mother Fatme Ousmane in the village of Louri in the Mao region of Chad. Achta's birth seven years ago coincided with the first major drought to hit the Sahel this decade. Climate change has meant that the normally once-a-decade droughts are now coming every few years. The droughts decimated her family's herd. With each dead animal, they ate less. (AP Photo/Rebecca Blackwell)
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