In this Aug. 12, 2016 photo, the retreating ice of the Pastoruri glacier is seen in the Huascaran National Park in Huaraz, Peru. The melting of glaciers like the Pastoruri has put cities like Huaraz, located downslope from the glacier about 35 miles (55 kilometers) away, at risk from what scientists call a “glof,” or glacial lake outburst flood. (AP Photo/Martin Mejia)

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