BBC: China's scarce water supply is being wasted as crops grown in water-stressed provinces are exported to wet, rainfall-rich areas, a study reports.
Farming accounts for about 65% of water use in China and the limited resource is coming under pressure from rapid urbanisation and industrialisation.
Officials have called the nation's water shortage a "grave situation" and called for strict water controls.
The findings appear in the Proceedings of the National Academy of Sciences.
Water worries...