Antarctic Meltwater Raises Alarm for Rapid Sea-Level Rise, Global Climate Disruptions

Nature Communications, 29 October 2025

Climate models fine-tuned to the interactions between ice sheets, oceans, and the atmosphere show that increasing Antarctic meltwater could alter global heat and precipitation patterns already this century, while simultaneously driving highly uneven sea-level rise and far-reaching climatic disruption. The study finds that Antarctic meltwater will slightly slow temperature rise in the Southern Hemisphere, but lead to faster warming in the North Atlantic, including eastern North America and Western Europe. It would also alter precipitation patterns worldwide. The study predicts East Antarctica will begin consistently contributing to sea-level rise by 2030 under very high emissions, or by 2040 under moderate emissions as ice shelves melt and break apart; surpassing the contribution from West Antarctica around 2080. Combined, West and East Antarctica could raise global sea levels over 3 meters by 2200 under very high emissions or 1 meter under moderate emissions. Pacific and Indian Ocean basins and the Caribbean Sea face disproportionately faster regional sea-level rise, staring down 4.3 meters by 2200 under very high emissions or 1.5 meters under moderate. With projected population growth combined with these sea-level rise estimates, over one billion people could be living in low-lying coastal areas within the next four decades, underscoring the need for rapid emissions reductions to minimize these destructive global impacts.

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