How did Soviet irrigation policies affect the Aral Sea?

Soviet irrigation policies, initiated in the mid-20th century, caused an ecological disaster by systematically diverting water from the Amu Darya and Syr Darya rivers to support large-scale cotton cultivation and other agricultural projects in Central Asia.123

These diversions drastically reduced the volume of water reaching the Aral Sea, leading to the following consequences:

• Shrinkage: The sea lost the vast majority of its surface area and volume, eventually receding into separate, smaller lakes.14
• Environmental Degradation: Increased salinity destroyed local fishing industries and killed off native fish populations.1
• Health and Climate Impacts: The exposed seabed became a source of toxic dust storms contaminated with salt and pesticides, contributing to severe health issues among local populations, including high rates of cancer and infant mortality. Additionally, the loss of the lake's moderating influence led to more extreme regional temperatures.14
• Contamination Risks: The receding waters created land bridges to islands like Vozrozhdenya, which had served as a secret Soviet biological weapons testing site, raising significant environmental and safety concerns.1