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As glacial retreat reaches critical levels in Bolivia, water stress plagues the cities of El Alto and La Paz.3,8,9 If our heat-trapping emissions continue to rise at current rates, many tropical glaciers in Latin America are likely to disappear within a few decades.12
◾Chacaltaya glacier, northeast of La Paz, lost more than 90 percent of its volume from the 1940s to the late 1990s-and disappeared completely in 2009.3,9,10,11
◾Average temperatures throughout the tropical Andes rose around 0.6° F (0.33° C) per decade in the last quarter of the twentieth century.13,14 Scientists have observed that temperature increases of as little as 0.2° F (0.1° C) per decade can cause glaciers to shrink dramatically.17
◾Melting of tropical Andean glaciers threatens the water supply of 30 million people, agriculture, hydropower, and the region's immense biodiversity.4,23
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Glaciers across South America have shrunk severely in recent decades, with many vanishing altogether.12 Scientists attribute the accelerating retreat of Andean glaciers to climate change—primarily warming temperatures, higher humidity, and shifting precipitation.13 Average temperatures throughout the tropical Andes have been rising since the mid-twentieth century, with the rate of increase jumping to around 0.6° F (0.33° C) per decade in the last quarter of the century.13,14
http://www.climatehotmap.org/global-warming-locations/chacaltaya-glacier-bolivia.html