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Andean glacier melt threatens floods, then drought

AlertNet: As glaciers melt in the Andes, western areas of South America can expect a period of repeated, extreme flooding that will later give way to drought conditions, creating new challenges for millions of people, researchers warn. Tropical Andean glaciers and high-altitude ecosystems are vital to the economies of Peru, Ecuador, Colombia and Bolivia. The 8 million inhabitants of Peru's capital Lima depend on them for drinking water. The Bolivian capital, La Paz, takes 30 to 40 percent of its drinking...