Global mean sea levels have risen faster in the 20th century than in any prior century over the past 3,000 years, threatening nearly a billion people.
The UN's Antonio Guterres warned of communities swamped, freshwater contaminated, crops ruined, while economies suffer as rising seas lead to unprecedented challenges.
The primary cause of sea-level rise is human-induced climate change, driven by melting ice and the expansion of seawater as temperatures rise.
The World Meteorological Organization reported that the average sea level globally reached a record high last year, signifying alarming climate changes.
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