FILE - Chunks of ice break off the Perito Moreno Glacier, in Lake Argentina, at Los Glaciares National Park, near El Calafate, in Argentina's Patagonia region, March 10, 2016. As glaciers melt and pour massive amounts of water into nearby lakes, 15 million people across the globe live under the threat of a sudden and deadly outburst flood, a new study finds. (AP Photo/Francisco Munoz, File)
  • Glacier Lake Floods
  • Glacier Lake Floods
  • Glacier Lake Floods
  • Glacier Lake Floods

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