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Responses to Drought and Flooding02:41

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Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
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Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
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Adaptations that Reduce Water Loss01:57

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Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
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Updated: May 30, 2025

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Deepening water scarcity in breadbasket nations.

Qinyu Deng1,2, Tyler Sharretts3, Tariq Ali4

  • 1School of National Safety and Emergency Management, Beijing Normal University, Beijing, China.

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Summary

Water scarcity is increasing in China, India, and the USA due to rising demand, particularly for irrigation. Many regions now face over four months of water shortage annually, straining resources.

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Area of Science:

  • Environmental science
  • Hydrology
  • Sustainability studies

Background:

  • Unsustainable water use threatens global wellbeing and environmental health.
  • Previous water scarcity assessments lacked detailed spatial and temporal resolution.
  • Accurate water resource management is vital for achieving sustainability targets.

Purpose of the Study:

  • To conduct a detailed monthly assessment of blue water scarcity evolution from 1980-2015.
  • To analyze water scarcity trends in China, India, and the USA at a sub-basin level.
  • To identify the drivers and extent of increasing water demand and scarcity.

Main Methods:

  • Monthly sub-basin assessment of blue water scarcity (surface and groundwater).
  • Analysis of water demand changes for specific crops and economic sectors.
  • Evaluation of temporal trends in water scarcity over a 35-year period (1980-2015).

Main Results:

  • Blue water demand increased significantly: 60% (China), 71% (India), 27% (USA), driven by irrigation of key crops.
  • Unsustainable demand during peak months rose substantially: 101% (China), 82% (India), 49% (USA).
  • Significant proportions of sub-basins face prolonged scarcity: 32% (China), 61% (India), 27% (USA) experience ≥4 months of scarcity annually.

Conclusions:

  • Rising water demands are exacerbating scarcity in already stressed regions.
  • Current water use patterns disproportionately impact vulnerable areas.
  • Findings support targeted interventions for balancing human and environmental water needs.