Soldiers patrol on the outskirts of Ciudad Juarez, Mexico, just across the Rio Grande from El Paso, Texas. Rodrigo Abd/AP hide caption

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Mexican nationals head across the international bridge connecting dusty Presidio, Texas, and Ojinaga, Mexico, after getting off a bus from Tucson earlier this month. Bob Daemmrich/Texas Tribune hide caption

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Roberto Silva, 31, holds his 3-year-old son, Adil Noe Silva, at the CURE Orthopedic Pediatric Hospital in San Pedro Sula, Honduras. Adil has spina bifida, and the doctors straightened his legs so that hopefully he will be able to walk with braces on his legs. The nonprofit hospital treats children with bone deformities such as clubfeet, dislocated hips and fused fingers. Jason Beaubien/NPR hide caption

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Until recently, Darci Eichelt planted soybeans across his entire 6,000-acre farm outside Lucas do Rio Verde in central Brazil. Now, Eichelt is planting native vegetation that will eventually cover about one-third of his property. He says he began to notice that the natural water supply had been affected by clear-cutting — and he understood that he had cleared more than he should have. Peter Breslow/NPR hide caption

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About 80 percent of Tumaco's people live on or alongside the water, where they are highly vulnerable to any changes in the climate or water levels. The flooding in recent years has caught many of the locals by surprise. Tom Gjelten/NPR hide caption

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