Global Sea Level Rise Accelerates As Climate Change Intensifies
Global sea levels are rising at twice the rate recorded two decades ago, according to a new international study published in Science Advances, with researchers warning that the trend is likely to continue for decades even if greenhouse gas emissions stabilise.
The study, conducted by scientists from China, the United States, and France, found that the annual rate of sea level rise accelerated to 3.94 millimetres per year between 2005 and 2023. Researchers linked the increase primarily to human-driven climate change, which is warming oceans and accelerating ice loss across the planet.
Warming Oceans Drive Rising Seas
The research identified thermal expansion as the single largest contributor to rising sea levels. As ocean water warms, it expands and occupies more space.
According to the study, thermal expansion accounted for 43 percent of the observed sea level rise during the period analysed.
Meanwhile, melting ice from glaciers and polar ice sheets contributed most of the remaining increase. Mountain glaciers represented 27 percent of the total rise, while the Greenland ice sheet accounted for 15 percent and the Antarctic ice sheet contributed 12 percent.
Terrestrial water storage changes made up the remaining three percent.
Scientists stated that human-caused warming continues to intensify both ocean heating and ice melt, adding increasing amounts of water into the global ocean system.
Coastal Communities Face Growing Risks
Researchers warned that the consequences of accelerating sea level rise are already becoming more visible worldwide.
Many coastal regions are experiencing more frequent flooding events, worsening shoreline erosion, and increasing saltwater intrusion into freshwater supplies. In addition, low-lying communities face mounting risks from land loss and storm surges.
The study also highlighted threats to biodiversity as ecosystems such as mangroves and coral reefs continue to deteriorate under changing ocean conditions.
These natural barriers play a crucial role in protecting coastlines from waves and storms. Their degradation leaves millions of people more vulnerable to climate-related disasters.
Scientists Warn Trend Will Continue
Importantly, the researchers stressed that sea level rise is expected to continue for decades even if greenhouse gas concentrations stabilise in the near future.
The climate system’s long response times mean oceans will continue warming and ice sheets will keep losing mass long after emissions slow or stop increasing.
As a result, scientists believe many long-term risks for coastal populations are already locked in.
The findings add to growing international concern over climate resilience, infrastructure planning, and the future habitability of vulnerable coastal areas as global temperatures continue to rise.