More than half of the world’s large lakes and reservoirs have shrunk since the early 1990s – chiefly because of the climate crisis and human consumption – intensifying concerns about water supply for agriculture, hydropower and human consumption, a study has found.
A team of international researchers reported that some of the world’s most important freshwater sources – from the Caspian Sea between Europe and Asia, to South America’s Lake Titicaca – lost water at a cumulative rate of about 22 gigatonnes a year for nearly three decades, equivalent to the total water use in the US for the entire year of 2015.
Fangfang Yao, a surface hydrologist at the University of Virginia who led the study published on Thursday in the journal Science, said 56% of the decline in natural lakes was driven by global heating and human consumption, with warming “the larger share of that”.
Climate scientists generally think that the world’s arid areas will become drier under climate change, and wet areas will get wetter, but the study found significant water loss even in humid regions.
“This should not be overlooked,” Yao said.
Scientists assessed almost 2,000 large lakes using satellite measurements combined with climate and hydrological models.
They found that unsustainable human use, changes in rainfall and run-off, sedimentation, and rising temperatures had driven lake levels down globally, with 53% of lakes showing a decline from 1992 to 2020.
Nearly 2 billion people around the world are directly affected, and many regions have faced water shortages in recent years.
Scientists and campaigners have long said that global heating can not exceed 1.5 degrees celsius (2.7 degrees fahrenheit) if we are to avoid the most catastrophic consequences of climate change. The world is currently warming at a rate of about 1.1C (1.9F).
Thursday’s study found unsustainable human use dried up lakes, such as the Aral Sea in Central Asia and the Dead Sea in the Middle East, while lakes in Afghanistan, Egypt and Mongolia were hit by rising temperatures, which can increase water loss to the atmosphere.
Water levels rose in a quarter of the lakes, often as a result of dam construction in remote areas such as the Inner Tibetan Plateau.