Yes, Antarctica is melting. Between 2002 and 2025, the continent lost roughly 135 billion tonnes of ice per year, raising global sea levels by about 0.4 millimeters annually. That rate is not uniform across the continent, and some regions are losing ice far faster than others, but the overall trend is clear and accelerating in key areas.
How Much Ice Antarctica Loses Each Year
Antarctica holds enough ice to raise global sea levels by roughly 58 meters if it all melted. Nobody expects that to happen anytime soon, but the amount disappearing each year is significant and measurable. NASA’s gravity-sensing satellites, which detect changes in Earth’s mass distribution, show the continent shedding about 132 billion tonnes per year on average. For context, every 360 billion tonnes of land ice lost adds one millimeter to global sea levels.
Year-to-year numbers fluctuate. In 2022, Antarctica briefly gained mass. In 2023, it lost 57 billion tonnes, with losses in the western half of the continent outpacing gains in the east. These swings are normal, but the long-term direction points steadily downward.
West Antarctica: The Fastest-Changing Region
The West Antarctic Ice Sheet is the primary source of concern. Two glaciers in particular, Thwaites and Pine Island, are responsible for most of the continent’s ice loss and have shown troubling changes over the past decade.
Thwaites Glacier, sometimes called the “Doomsday Glacier,” has experienced dramatic thinning. Between 2014 and 2017, parts of the glacier’s surface dropped by up to 80 meters, with the underside melting at rates reaching 200 meters per year in localized areas. The point where the glacier lifts off the bedrock and begins floating, called the grounding line, has retreated significantly and has not re-advanced. A full collapse of Thwaites could eventually contribute several meters to sea level rise.
Pine Island Glacier, Antarctica’s largest single contributor to sea level rise, sped up by more than 12% between late 2017 and 2020. Ice near its grounding line now flows at over 4,000 meters per year. The cause: a 19-kilometer retreat of its floating ice shelf, which lost about 20% of its area in three years. That shelf acts like a cork in a bottle, bracing the glacier against the walls of its embayment. As it breaks apart, the glacier behind it flows faster into the ocean.
What’s Driving the Melt
The biggest driver is warm ocean water eating away at ice shelves from below. Deep currents carry water that is more than 2°C above the freezing point at depth into cavities beneath the floating edges of glaciers. This warm water flows directly under the ice, melting it from the bottom up. Multiple lines of evidence confirm this process: temperature measurements at the ice front, velocity readings of warm water flowing into sub-shelf cavities, and the chemical signature of glacial meltwater in the outflow.
This mechanism matters because ice shelves do more than just float there. They hold back the massive glaciers on land, slowing their flow toward the sea. As shelves thin and break apart, the glaciers behind them accelerate. It’s a feedback loop: ocean warming thins the shelves, thinning removes the brakes, and more ice flows into the ocean, raising sea levels.
Surface melting also plays a role, especially on the Antarctic Peninsula, the narrow arm of land reaching toward South America. This region has warmed faster than almost anywhere else on Earth. One station recorded a warming trend of 0.46°C per decade from 1951 to 2018, totaling more than 3°C over that period. Surface melt on the Peninsula creates pools of water that can wedge into cracks and fracture ice shelves from above.
Sea Ice vs. Land Ice
When you see headlines about Antarctic ice, it helps to know which type is being discussed. Land ice sits on the continent itself and raises sea levels when it melts into the ocean. Sea ice forms when the ocean surface freezes in winter and mostly melts each summer. Because sea ice is already floating, its melting doesn’t directly raise sea levels (just as a melting ice cube doesn’t overflow a glass). But losing sea ice does affect ocean temperatures, weather patterns, and marine ecosystems.
Antarctic sea ice has entered what some scientists describe as a wholly new state. After decades of gradual expansion that peaked in 2014, sea ice extent declined so rapidly that by 2018, the losses had wiped out the previous 35-year gain. Then came 2023, which set a record low for winter sea ice, and 2024, which was the second lowest on record. The 2024 winter maximum was nearly 600,000 square miles below the 1981 to 2010 average. That missing area is larger than Alaska.
East Antarctica Is Not Immune
East Antarctica holds the vast majority of the continent’s ice and has long been considered relatively stable. In some years, increased snowfall actually adds mass to the eastern ice sheet, partially offsetting losses in the west. But “stable” is not the same as “safe.” Research on the Totten Ice Shelf in East Antarctica has confirmed that warm deep water reaches its cavity through seafloor troughs, driving rapid melting from below. This is the same mechanism destabilizing glaciers in West Antarctica, and it suggests that parts of the eastern ice sheet are more vulnerable than previously thought.
Temperature Thresholds and Long-Term Risk
A key question is whether Antarctica’s ice loss could become irreversible, crossing a tipping point where melting feeds on itself regardless of future emissions reductions. A 2025 review in Nature concluded that the West Antarctic Ice Sheet could be triggered into instability somewhere between 1.5°C and 2°C of warming above pre-industrial levels. The authors went further, hypothesizing that the actual threshold probably lies close to or even below 1.0°C, a level the world has already passed. Marine-based sectors of the East Antarctic Ice Sheet face similar risks at 2°C to 3°C of warming.
Under high-emissions scenarios, projections suggest Antarctica alone could contribute up to 15 centimeters of sea level rise by 2100. That number may sound modest, but it compounds with contributions from Greenland, thermal expansion of warming oceans, and mountain glacier melt. Combined, these sources could push total sea level rise well above half a meter this century, with consequences for coastal cities, infrastructure, and hundreds of millions of people living near shorelines.
The ice Antarctica has already lost will not return on any human timescale. Ice sheets take thousands of years to build and can disintegrate far more quickly than they form. The trajectory of the next few decades, particularly in West Antarctica, will determine whether ice loss remains gradual or accelerates into something far more difficult to adapt to.