In this Aug. 12, 2016 photo, a group of tourists walk past a photo featuring an image of the Pastoruri glacier before its retreat, during a tour called “The Route of Climate Change” in Huaraz, Peru. Benjamin Morales Arnao, the head of Peru’s National Institute for Glacier Research, said that while the country’s glaciers “are a source of life, due to their water resources and biodiversity … these glaciers are also a source of glacier glacial catastrophes.” (AP Photo/Martin Mejia)

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