Climate

Explainer: How sea level rise poses an ‘existential threat’ to humans, heritage and nature

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 23/09/2026, 09:20:24 UTC.

Briefings

A September 2026 article by Carbon Brief explains how rising sea levels pose existential threats to humans, heritage, and nature. It highlights that global sea levels rose 20cm between 1901-2018, accelerating to 10.6cm since 1993. The UN General Assembly is adopting a declaration labeling sea level rise an 'existential threat.' Approximately 770 million people face acute risk, including major coastal cities in Asia and island nations. Under moderate emissions, sea levels could rise an additional 56cm by 2100. Local risks include flooding, storm surges, and subsidence, with Jakarta sinking up to 15cm annually. Population growth in coastal areas continues to outpace inland growth, increasing potential economic losses from flooding.

Key points

• Global sea levels rose 20 centimeters between 1901 and 2018, driven by glacier melt, ice sheet melting, and seawater expansion.
• Under a moderate-emissions scenario, scientists predict global average sea level will rise an additional 56 centimeters by 2100 relative to a 1995-2014 baseline.

Context and limitations

Coverage is limited to the UN General Assembly declaration and Carbon Brief's analysis of key threats; specific local adaptation strategies beyond Venice are not detailed.

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