Global sea levels are rising faster today than at any point in three millennia.

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: The oceans are swelling at an unprecedented pace, driven by melting ice and the thermal expansion of warming water. While sea levels have shifted throughout Earth's history, the current acceleration is a direct consequence of human-induced climate change, threatening coastal populations and ecosystems with a future of inevitable, long-term inundation.

Since the end of the Last Glacial Maximum roughly 20,000 years ago, global sea levels have climbed by over 125 meters. However, the modern trend is distinct; between 1901 and 2018, the average global sea level increased by approximately 20 centimeters. This rate has surged significantly in recent decades, reaching 4.62 millimeters per year during the 2013–2022 period. Scientific consensus identifies human-driven climate change as the primary catalyst for this persistent acceleration, with melting ice sheets and glaciers responsible for 44 percent of the rise observed between 1993 and 2018.

The climate system possesses significant inertia, meaning sea levels will continue to climb for decades even if warming stabilizes. Projections for 2100 vary widely based on greenhouse gas emission scenarios. Under high-emission pathways, some models suggest a rise of up to 1.9 meters by the end of the century. More extreme, low-confidence scenarios—incorporating processes like marine ice cliff instability—suggest even higher potential increases. Beyond 2100, the long-term outlook is even more profound; if global temperatures peak at 5 degrees Celsius above pre-industrial levels, sea levels could eventually rise by 19 to 22 meters over the next two millennia.

Impacts are not uniform, as local factors like land subsidence and tidal patterns dictate regional severity. Coastal communities face a spectrum of threats, from increased flooding and storm surges to the loss of vital ecosystems and the salinization of agricultural water. Adaptation strategies range from hard infrastructure, such as seawalls, to managed retreat and nature-based solutions like dune rehabilitation. Yet, these responses are often constrained by economic resources, highlighting a stark environmental justice dimension: vulnerable populations frequently face the highest risks with the fewest tools to protect their ancestral lands and livelihoods.

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