Where Glaciers Melt, the Rivers Run Red

As the glaciers of South America retreat, the supply of freshwater is dwindling and its quality is getting worse.

The New York Times
Dark red pools of meltwater from acid rock drainage on Pastoruri peak in the Cordillera Blanca, a Peruvian mountain range containing the world’s largest concentration of tropical glaciers.
Lake Palcacocha, which has maintained an alkaline pH of around 7.5, but scientists expect it to turn increasingly acidic as leaching expands.CreditCredit...