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Global water gaps under future warming levels.

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Climate change significantly widens water gaps, increasing scarcity. Future warming will exacerbate this, necessitating urgent climate mitigation and robust water management strategies to address global water resource stress.

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Area of Science:

  • Environmental Science
  • Climate Science
  • Hydrology

Background:

  • Climate change impacts water resources globally.
  • Understanding water gaps (unsustainable water use) is key for adaptation.
  • Quantifying water scarcity under different warming scenarios is critical.

Purpose of the Study:

  • To quantify current and future global water gaps.
  • To assess the impact of 1.5°C and 3°C warming scenarios on water scarcity.
  • To highlight regional disparities in water gap projections.

Main Methods:

  • Multi-model analysis of water demand and supply.
  • Incorporation of two distinct future warming scenarios (1.5°C and 3°C).
  • Quantification of baseline and projected water gaps in km³/yr.

Main Results:

  • Baseline global water gap is 457.9 km³/yr.
  • Projected increases in water gaps of 5.8% (1.5°C) and 14.7% (3°C).
  • Significant regional differences and model variability observed in projections.

Conclusions:

  • Climate change intensifies water scarcity, with higher warming levels causing greater impacts.
  • Unequal adaptation needs exist across countries and basins.
  • Urgent climate mitigation and robust water management are essential to combat escalating water scarcity.