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Sea Levels Surge: Existential Threat Looms
2 Oct
Summary
- Sea level has risen 21 cm since 1880, with acceleration in recent years.
- Melting glaciers and thermal expansion of warming oceans cause sea level rise.
- Low-lying island nations face existential threats from rising seas.
The United Nations has adopted its first declaration on sea level rise, acknowledging the existential threat it poses globally. Since the early 2000s, global sea levels have risen approximately 38 cm even on the lowest emissions path, with potential increases to 77 cm if emissions continue to climb. Records show a significant acceleration in this rise.
This increase is primarily attributed to two factors: the melting of glaciers and ice sheets due to global warming, and the thermal expansion of seawater as it warms. Oceans have absorbed about 90% of atmospheric warming over the past 50 years, doubling the pace of ocean heating in the last two decades.
Coastal regions worldwide are experiencing severe impacts, including erosion, flooding, and saltwater intrusion. Small island nations like Fiji, the Maldives, and Tuvalu are at critical risk, with some populations already seeking climate-related migration. India's coastal cities, including Mumbai and Chennai, are also projected to face significant submersion by 2050.
While reducing emissions is the ultimate solution, some degree of sea level rise is now unavoidable. Countries are implementing adaptation measures, such as building sea walls and restoring coastal ecosystems. However, developing regions often require financial assistance to cope with these escalating climate change consequences.
