Why has the Aral Sea shrunk and become saltier? The climate has become more tropical.
A water pipeline has drained the lake.
Water was diverted from rivers to feed cash crops.
Factories have used up water resources.

Once the fourth largest lake in the world, Central Asia's shrinking Aral Sea has reached a new low, thanks to decades-old water diversions for irrigation and a more recent drought. Satellite imagery released this week by NASA shows that the eastern basin of the freshwater body is now completely dry.

The climate has become more tropical

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