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Global warming is not a future threat to Asia's freshwater supplies — it is disrupting them now. Water availability across the continent is already being affected by changing climate patterns including unpredictable rainfall, prolonged droughts, floods and glacier melting.[W1] Water scarcity is already diminishing crop yields, hampering hydropower generation and spurring migration.[W2] India's per capita freshwater availability is projected to fall to 1,341 cubic metres by 2025 and 1,140 cubic metres by 2050,[W8] moving the country closer to "water-scarce" territory (defined as below 1,000 cubic metres per capita), while in Bangladesh, rising sea levels and seawater intrusion threaten both freshwater supplies and agricultural productivity in coastal areas.
Quarex's chapter on water infrastructure under climate stress frames the saltwater intrusion problem mechanically: seawater pushes inland under ocean pressure while freshwater from rainfall flows toward the ocean, with the two masses normally held in balance. Climate change disrupts this equilibrium through sea level rise and slower groundwater replenishment due to warmer, drier regional climates. [L3] The IPCC's Sixth Assessment Report confirms that both climatic and non-climatic drivers have created water stress conditions in water supply and demand across most Asian sub-regions.[W1]
The most severe threats are projected for mid-century. By the 2050s, the transboundary river basins of the Amu Darya, Indus and Ganges could face severe water scarcity challenges due to climatic variability.[W1] Terrestrial water storage in the Qinghai-Tibet Plateau — Asia's "water tower" — is expected to sustain significant net declines by 2060.[W6]
Quarex's chapter on the global water crisis identifies the Ganges River headwaters in the Himalaya Mountains of northern India and the Indus River flowing from Tibet to the Arabian Sea as global hotspots with negative trends in water storage, [L2] placing India among the countries projected to be most severely affected in terms of growth in water-scarce urban population, with an increase of 153–422 million people between 2016 and 2050.[W8] That same chapter notes that approximately 1.2 billion people — about one-sixth of the global population — live in agricultural areas with severe water constraints, with Southern Asia hosting about 520 million and Eastern and South-eastern Asia approximately 460 million people in such conditions.[W9] [L2]
Glacial retreat in the Hindu Kush Himalaya endangers the water supplies of 2 billion people downstream who rely on snow-fed rivers for drinking water, irrigation and hydropower.[W7] Quarex's chapter on the global water crisis details how glacier mass loss in 2023 and 2024 was among the worst years on record, with about 41% of total glacier loss since 1976 occurring during the last decade from 2015 to 2024.[W10] [L2] Rivers such as the Indus, Ganges and Brahmaputra have experienced increased flow due to accelerated melting, but climate models warn they could suffer drastic reductions in coming decades, forcing communities to rely more on groundwater and increasing aquifer overexploitation. [L2]
Agriculture dominates Asia's water consumption and faces compounding threats. Quarex's chapter on irrigation infrastructure under scarcity notes that an additional 150 million hectares of croplands will be affected by prolonged and more intense green water scarcity under plausible warming scenarios.[W11] [L1] The chapter also notes that loss of glaciers will eventually impact the amount of surface water available for agriculture in key producing basins, though the specific claim that glaciers support 40 percent of the world's irrigation could not be confirmed against a primary source. Countries that relied solely on rainfed agriculture now experience temporal physical water scarcity due to irregular rainfalls that disrupt usual planting seasons, causing recurring crop failures. [L1]
Water scarcity is intensifying conflict risks across shared river basins. Quarex's chapter on climate geopolitics notes that without mitigation and adaptation measures, nearly 40% of global transboundary river basins could face potential conflicts driven by water scarcity in 2041–2050, with hotspots in southern and central Asia.[W12] [L4] The Diplomat reports that roughly 40% of the world's population lives in transboundary river and lake basins, yet only a fifth of countries have cross-border agreements to jointly manage these shared resources equitably.[W5] On 23 April 2025, India put the Indus Water Treaty in abeyance following the Pahalgam terror attack, citing national security concerns and unresolved issues including climate change,[W13] [L4] demonstrating how climate stress activates dormant tensions in ungoverned spaces where upstream nations gain leverage over downstream neighbors.
Asian countries could experience an increase in drought conditions of 5-20% by the end of this century.[W1] The crisis combines multiple reinforcing factors: glacier melt, changing monsoon patterns, groundwater depletion, seawater intrusion in coastal areas and ecosystem degradation — all exacerbated by climate change.[W3] Quarex's chapter on Earth's water systems notes that freshwater species have declined by approximately 85% since 1970, the steepest drop of any ecosystem, largely due to habitat loss, fragmentation, overuse and pollution,[W14] [L5] reflecting the compounding pressures on water systems that both supply and sustain life across the continent.