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Preparation of Free-Surface Hyperbolic Water Vortices
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(Virtual) Water Flows Uphill toward Money.

Ranran Wang1, Edgar Hertwich1, Julie B Zimmerman1,2

  • 1School of Forestry and Environmental Studies, Yale University , New Haven, Connecticut 06520, United States.

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Affluence, not freshwater availability, drives virtual water imports. Higher incomes significantly increase per capita blue water consumption, highlighting affluence as a key factor in global water resource management.

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Area of Science:

  • Environmental Science
  • Resource Economics
  • Global Water Resources

Background:

  • Anthropogenic water use is complex, involving both blue water (fresh surface and groundwater) and green water (rainwater).
  • Previous studies often assumed a uniform relationship between population, affluence, and water consumption.
  • Understanding the drivers of water use is crucial for sustainable resource management and the water-energy-food-land nexus.

Purpose of the Study:

  • To precisely identify the main driving forces of anthropogenic water use (blue and total) across countries.
  • To analyze the impact of population and affluence on water consumption, production, and trade.
  • To investigate the relationship between affluence and virtual water imports.

Main Methods:

  • Distinguished between blue water and total water (blue + green water) consumption.
  • Measured water use per country and per capita for producing, consuming, exporting, and importing goods and services.
  • Analyzed data for 110 countries in 2007, focusing on the effects of population and income levels.

Main Results:

  • The population effect on national blue water consumption is larger than previously estimated.
  • Affluence has varying effects on water use depending on the account (production vs. consumption, blue vs. green) and income level.
  • Affluence, not freshwater availability, is the primary driver of virtual water imports; higher incomes strongly correlate with increased per capita blue water consumption (82-86% increase per income doubling).

Conclusions:

  • Affluence is a more critical driver of water use patterns, particularly virtual water imports, than previously recognized.
  • High-income countries exhibit greater per capita blue water consumption, underscoring the impact of affluent lifestyles.
  • Future research on the water-energy-food-land nexus must incorporate affluence as a central factor for effective resource management.