As the glaciers of South America retreat, the supply of freshwater is dwindling and its quality is getting worse. As the glaciers of South America retreat, the supply of freshwater is dwindling and its quality is getting worse. Glaciers, Water, Rivers, Water Pollution, Global Warming, Agriculture and Farming, Mountains, Metals and Minerals, Pollution, Andes Mountains, Peru, your-feed-science, your-feed-health NYT > Science