e the 1980s.
Throughout history, its water resources have been a source of wealth, enabling food production and transport. To get a closer estimate of the long-term trend over an area nearly a fifth to China’s total land mass, Nie’s team used not only records from ground stations but also satellites that could detect the change of gravity caused by water in the crust.
Evaporation increased as well, partly because of higher temperatures, partly because of human activities, with ever-growing cities accelerating the loss of water into the atmosphere. “[For example] the concentration of pollutants can increase in the river and poison more vulnerable species,” said Xie, who was not involved in the study.
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