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In 2021, the IPCC concluded, with high confidence, that the global mean sea level is rising at an unprecedented rate not seen in at least 3,000 years due to human-induced climate change.
This technical note summarizes the latest scientific data on sea-level rise and its current and projected effects—including coastal flooding—on a global and regional scale, with a focus on major coastal cities in the G20 countries and small island developing states in the Pacific.
The findings demonstrate that sea-level rise is currently impacting the lives and livelihoods of coastal communities and low-lying island nations worldwide, and it is accelerating. The climate actions and decisions made by leaders and policymakers in the coming months and years will determine the extent of the devastating effects and how quickly they will worsen.
