The amount lost in the last 30 years is equivalent to 17 Lake Meads — the largest reservoir in the U.S.
Over half of the world’s largest lakes and reservoirs now hold less water than they did three decades ago — and a warming climate and human water consumption are largely to blame, researchers have found.
Only around a quarter of lakes and reservoirs now store more water than in 1992. The researchers also found that a quarter of the world’s population lives within the basins of drying lakes. “This suggests that the drying trend worldwide is more extensive than previously thought,” study lead author Fangfang Yao, a climate researcher at the University of Virginia, told Live Science. Yao said the study was motivated by the crisis of the Aral Sea in Central Asia, which was the fourth-largest lake in the world before it began drying up in the 1960s. In 2014, NASA released a satellite image showing that the eastern part of the South Aral Sea had completely disappeared.
The researchers used a statistical model to work out the main underlying causes of lake and reservoir water loss. Climate warming and human consumption were the main drivers of water loss from lakes, whereas sedimentation — the buildup of debris — was the biggest driver in reservoirs. “Sedimentation is kind of a creeping disaster, since it happens over the course of years and decades,” Yao said.
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