https://www.nytimes.com/2013/04/05/world/americas/1600-years-of-ice-in-perus-andes-melted-in-25-years-scientists-say.html In Sign of Warming, 1,600 Years of Ice in Andes Melted in 25 Years] April 4, 2013 New York Times In the case of Qori Kalis Glacier, which is one of Quelccayas' outlet glaciers, the rate of retreat had reached 155 meters per year during the three-year period of 1995 to 1998.