Water scarcity

**Types of Water Scarcity:**
– Physical water scarcity: Occurs when natural water resources are insufficient to meet demands.
– Economic water scarcity: Caused by a lack of investment in water infrastructure, leading to people traveling long distances for water.
– Over 1.2 billion people live in areas with physical water scarcity.
– Human activities worsen physical water scarcity.

**Related Concepts and Assessments:**
– Water stress, water scarcity, and water risk are distinct concepts.
– Water stress includes availability, quality, and accessibility of water.
– Water security aims to maximize benefits for humans and ecosystems while minimizing risks.
– Water risk encompasses issues like scarcity, stress, flooding, and infrastructure decay.
– Indicators like water use ratio and water stress indices help measure water stress.

**Impacts and Future Predictions:**
– Half of the world’s population faces severe water scarcity.
– Almost 2 billion people lack access to clean drinking water.
– By 2025, 1.8 billion people will live in areas with absolute water scarcity.
– Global water demand is predicted to surpass supply by 40% by 2030.
– Water scarcity leads to restrictions on water use, conflicts, declining service standards, and food insecurity.

**Groundwater Depletion and Environmental Impacts:**
– Groundwater supplies nearly half of the world’s drinking water, with concerns about diminishing water quality and recharge rates.
– Overuse of water in agriculture leads to salinity, nutrient pollution, and loss of floodplains.
– Water scarcity results in adverse effects on lakes, rivers, wetlands, and other freshwater resources.
– Vegetation, wildlife, and ecosystems are impacted by reduced water availability.
– Urbanization and industrialization pose challenges in managing water resources sustainably.

**Causes and Contributing Factors:**
– Population growth and changing lifestyles increase global water consumption.
– Agriculture and industrial activities contribute significantly to water scarcity.
– Groundwater over-exploitation and globalization further strain water resources.
– Lack of investment in water infrastructure leads to economic water scarcity.
– Water crisis attributed to governance issues, mismanagement, and lack of property rights.