# Global water cycle disruption and freshwater decline

> Live situation record from CLSTR: https://clstr.news/situations/global-water-cycle-disruption-and-freshwater-decline
> Updated: 2026-09-17T05:07:41.000Z. Sources: 23. Developments: 2.

The World Meteorological Organization (WMO) has reported that the global water cycle is becoming increasingly erratic and unpredictable, driven by fossil fuel pollution and extreme temperatures. Data indicates a decade-long decline in freshwater storage across rivers, lakes, aquifers, ice, snow, and soils, with a continuous decline noted since approximately 2016.

Reports highlight that 2025 was one of the warmest years on record, leading to significant glacier shrinkage, with an estimated loss of 1,400 gigatonnes of water mass between 2023 and 2025. This loss represents roughly one-third of the total freshwater extracted globally in a single year. This warming has contributed to extreme swings between floods and droughts. In 2025, 42% of the world experienced storage levels below historical norms, and nearly two-thirds of monitored wells showed conditions deviating from historical patterns.

Notably, 2025 was among the driest periods for global rivers in the last 35 years, significantly impacting North America, South America, Eastern Europe, the Middle East, and Central Asia. While some regions like parts of South Asia experienced excess water, more than one-third of global river basins saw below-normal flows.

WMO Secretary-General Celeste Saulo expressed concern over the depletion of ‘slow reserves’ such as glaciers and groundwater, describing these as the planet’s ‘savings account’ that traditionally buffers against droughts, but warned they are now being rapidly exhausted. She cautioned that as these reserves diminish, droughts are increasingly likely to transition directly into acute water crises.

## Claims

- 2025 was one of the driest years for global rivers in the last 35 years. (corroborated by 13 sources)
- Freshwater stored on land has been declining globally since approximately 2016. (corroborated by 12 sources)
- Between 2023 and 2025, approximately 1,400 gigatons of glacier ice melted. (corroborated by 10 sources)
- The global water cycle is becoming more erratic and unpredictable due to fossil fuel pollution. (corroborated by 8 sources)
- In 2025, 42% of the world had freshwater storage levels below historical norms. (corroborated by 8 sources)
- Approximately two-thirds of monitored groundwater wells are experiencing conditions outside historical norms. (corroborated by 6 sources)

## Timeline

### 2026-09-17: United Nations warns of increasingly unpredictable global water cycle

The UN warns of an increasingly erratic global water cycle, noting a decade-long decline in freshwater reserves, shrinking glaciers, and depleting groundwater levels.

7 sources. https://clstr.news/cluster/united-nations-warns-of-increasingly-unpredictable-global-water-cycle

### 2026-09-17: WMO warns of critical decline in global freshwater reserves

A WMO report warns that global freshwater reserves are declining, with 2025 marking one of the driest years for rivers in 35 years and 1,400 gigatons of glacier ice melting since 2023.

16 sources. https://clstr.news/cluster/world-meteorological-organization-warns-of-global-water-cycle-disruption

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Cite as: Global water cycle disruption and freshwater decline. CLSTR, https://clstr.news/situations/global-water-cycle-disruption-and-freshwater-decline