# Global sea level rise and coastal vulnerability

> Live situation record from CLSTR: https://clstr.news/situations/global-sea-level-rise-and-coastal-vulnerability
> Updated: 2026-10-19T02:04:20.000Z. Sources: 4. Developments: 2.

Global sea levels have risen between 21 and 24 cm since 1880, a phenomenon driven by the thermal expansion of warming seawater and the melting of mountain and polar ice. Data from NASA shows that approximately 49,000 gigatonnes of ice transitioned into seawater between 1901 and 2015. Observers have noted a lack of focus on fluctuations in total water volume and the resulting depletion of freshwater in lakes, rivers, and groundwater.

Recent data indicates that sea level rise is accelerating at a rate faster than at any point in the last three millennia, primarily due to human activities since 1970. Since 1993, an additional 10.6 cm has been recorded. This trend poses significant risks to the approximately 770 million people living in areas less than five meters above high tide, who face increased threats from flooding, beach erosion, and storm surges.

Economic vulnerabilities are particularly evident in coastal tourism. A 2025 study of Surf City 2 by the United Nations Development Programme (UNDP) found that while 73% of surveyed tourism enterprises are located in natural threat zones, only 14% carry insurance and none have documented business continuity plans. Under moderate emission scenarios, sea levels could rise by an additional 56 cm by 2100 compared to the 1995–2014 period.

## Timeline

### 2026-10-19: Global sea level rise threatens coastal populations and economies

Rising sea levels and melting ice sheets threaten coastal populations and tourism economies, with millions living in high-risk zones and many businesses lacking adequate insurance or disaster plans.

2 sources. https://clstr.news/cluster/global-sea-level-rise-threatens-coastal-populations-and-economies

### 2026-09-25: Global sea levels rise due to polar ice melt and warming

Global sea levels have risen 21-24 cm since 1880 due to polar ice melt and thermal expansion, while freshwater reserves continue to decline.

2 sources. https://clstr.news/cluster/global-sea-levels-rise-due-to-polar-ice-melt-and-warming

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Cite as: Global sea level rise and coastal vulnerability. CLSTR, https://clstr.news/situations/global-sea-level-rise-and-coastal-vulnerability