How did Soviet irrigation projects contribute to environmental problems in Central Asia?

Soviet irrigation projects in Central Asia, primarily designed to support large-scale agriculture such as cotton cultivation, caused one of the most significant ecological disasters of the 20th century. By diverting the waters of the Amu Darya and Syr Darya rivers to irrigate arid lands, these projects drastically reduced the inflow into the Aral Sea.123

The environmental consequences were profound:

• Shrinkage of the Aral Sea: Deprived of its primary water sources, the sea lost the vast majority of its volume and surface area, eventually splitting into separate, increasingly saline lakes.43
• Toxic Pollution: The intensive use of chemical fertilizers and pesticides in cotton fields contaminated the river systems. As the sea receded, the exposed seabed became a source of toxic dust storms, which carried salt and chemical residues across the region.4512
• Health and Climate Impacts: The local climate became harsher with more extreme temperature fluctuations. Furthermore, the population in the region suffered from high rates of various diseases and disorders due to the contaminated environment.13
• Loss of Biodiversity and Industry: The increased salinity and pollution destroyed the local fishing industry and decimated native fish populations.43