A recent study published in Science reveals that over 53% of the world’s largest lakes are experiencing significant water depletion due to climate change, excessive human water use, and sedimentation. Led by Fangfang Yao, the study introduces a novel method that uses satellite data and models to monitor water storage trends in nearly 2,000 lakes and reservoirs, accounting for 95% of the planet’s lake water storage. This comprehensive assessment provides new insights into the effects of human activity and climate variations on these ecosystems, previously underestimated in many regions.
Although iconic water bodies like the Caspian Sea and Aral Sea are occasionally studied, this research offers a broader global perspective. The findings indicate a net decline in natural lake volume, with 2 billion people living in areas affected by drying lakes. The results highlight that sedimentation is a leading factor in the decline of reservoir storage. Despite this grim picture, some lakes have seen increases in water storage, attributed to improved water management policies, as evidenced by Lake Sevan in Armenia. The study emphasizes the urgent need for sustainable water resource management in light of the significant challenges posed by climate change and human consumption trends.
