Some of the World's Biggest Lakes Are Drying Up. Here's Why. (National Geographic)

Warming climates, drought, and overuse are draining crucial water sources, threatening habitats and cultures.

Tire tracks stretched across the flat lake bed to the horizon. We followed them in a Suzuki 4x4, looking for clues about what’s happened to Poopó, once Bolivia’s second largest lake, which has vanished into the thin air of the Andean highlands.
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