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Virtual scarce water in China.

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Virtual water flows reveal China's water crisis: Developed coastal regions deplete water in scarce northern provinces. Addressing water shortage requires considering water scarcity in policy.

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Area of Science:

  • Environmental Science
  • Water Resource Management
  • Economic Geography

Background:

  • Water footprints and virtual water flows are key indicators of human water use.
  • Traditional analyses often neglect environmental impacts and water scarcity.
  • China faces a severe water crisis due to economic growth, particularly in water-scarce regions.

Purpose of the Study:

  • To incorporate water scarcity and ecosystem impacts into virtual water flow analysis.
  • To assess inter-regional virtual water flows and their associated impacts across 30 Chinese provinces.
  • To provide a more comprehensive understanding of water consumption and scarcity drivers.

Main Methods:

  • Multiregional input-output analysis was employed.
  • Water scarcity and ecosystem impacts were integrated into the model.
  • Virtual water flows were analyzed among 30 provinces in China.

Main Results:

  • Virtual water flows are significantly altered when water scarcity is considered.
  • Developed coastal provinces rely heavily on water resources from water-scarce northern regions (e.g., Xinjiang, Hebei, Inner Mongolia).
  • Highly developed, water-scarce regions (e.g., Shanghai, Beijing, Tianjin) import virtual water, exacerbating depletion in other water-scarce provinces.

Conclusions:

  • Relying on virtual water imports from other water-scarce regions may merely shift pressure, not solve the overall water problem.
  • Effective water footprint policies must account for water scarcity.
  • Identifying virtual water flows from water-poor regions is crucial for alleviating water shortages.