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Water scarcity is depletion of water resources or you can very less availability of water in a particular area due to which people cannot fulfill their basic needs.
It occurs due to -
Inadequate access to safe drinking water for about 884 million peopleInadequate access to sanitation for 2.5 billion people which often leads to water pollutionGroundwater overdrafting (excessive use) leading to diminished agricultural yieldsOveruse and pollution of water resources harming biodiversityRegional conflicts over scarce water resources sometimes resulting in warfare