The last bit of ice shelf is poised to disintegrate. It's definitely going to go.
At the edge of the world, a glacier the size of Great Britain is quietly approaching a threshold that could rewrite the geography of human civilization. Scientists monitoring Thwaites Glacier in West Antarctica warn that its eastern ice shelf — the frozen buttress holding back an immense volume of land ice — may disintegrate within months, the result of warming ocean waters and shifting winds that bear the fingerprints of human activity. The collapse would not flood coastlines overnight, but it would remove the last restraint on a glacier whose full loss could raise global sea levels by more than ten feet, reshaping the futures of coastal communities from the Maldives to Miami. What unfolds at the bottom of the planet, it seems, belongs to everyone.
- Satellite images show Thwaites' eastern ice shelf cracking at twice the rate of a year ago, with researchers saying disintegration could come within months — not decades.
- The shelf acts as a buttress holding back the full weight of the glacier; once it breaks, nothing remains to slow the ice's descent into the Southern Ocean.
- A Thwaites collapse alone would raise global sea levels by roughly 2.1 feet, enough to intensify flooding in Miami, Mumbai, and dozens of other coastal cities.
- The deeper fear is a cascade: neighboring glaciers could follow, putting the entire West Antarctic ice sheet in motion and triggering a sea level rise exceeding ten feet.
- Nations with the least power to adapt — Bangladesh, the Maldives, Pacific island states — face the gravest consequences, including mass displacement and contaminated freshwater.
- Scientists are refining projections and timelines remain uncertain, but the direction of the evidence is no longer in serious dispute.
In West Antarctica, where the continent meets the Southern Ocean, Thwaites Glacier — a wall of ice roughly the size of Great Britain — is cracking apart. The eastern ice shelf, which acts as a brake on the glacier's seaward flow, is peeling away at twice the rate recorded just a year ago. Researchers with the International Thwaites Glacier Collaboration say it could disintegrate within months. This is not a modeled worst case. Satellite images show it nearly at the breaking point.
Thwaites has been retreating since the 1980s, as warm ocean water eats away at its underside. In three decades it has lost more than twelve miles of ground. The ice shelf that remains is the last thing holding the larger glacier in check — a buttress propping up a wall. Without it, the glacier accelerates, dumping land ice into the sea and raising global water levels. Glaciologist Robert Larter of the British Antarctic Survey was direct: the remaining shelf is poised to go, and it is going.
The mechanism is climate change. Shifting Southern Hemisphere wind patterns — linked to human activity — are driving warm, salty deep water up beneath the shelf and melting it from below. The glacier is already losing hundreds of billions of tons of ice each year, a figure that could reach 200 billion tons annually by 2067.
The shelf itself is floating, so its collapse won't trigger an immediate flood. But it removes the only thing slowing Thwaites' slide into the ocean. If the glacier collapses alone, sea levels rise by approximately 2.1 feet — enough to inundate parts of Miami, Mumbai, and beyond. But Thwaites is the widest glacier on Earth, over 75 miles across, and its fall could destabilize neighboring glaciers. A full West Antarctic ice sheet collapse would raise sea levels by more than ten feet, redrawing coastlines entirely.
Timelines remain uncertain — full collapse could take decades or centuries — but uncertainty does not reduce the stakes. Bangladesh, the Maldives, and Pacific island nations face flooding, freshwater contamination, and displacement. Major cities face higher storm surges and more frequent inundation. What is happening at the bottom of the planet will reach the lives of people thousands of miles away, sooner or later.
In West Antarctica, where the continent meets the Southern Ocean, sits Thwaites Glacier—a wall of ice roughly the size of Great Britain, and according to scientists, on the edge of catastrophic failure. The eastern ice shelf, the floating portion that acts as a brake on the glacier's flow, is cracking apart. Researchers working with the International Thwaites Glacier Collaboration say it could disintegrate within months. This isn't a distant threat or a model's worst-case scenario. Satellite images show the shelf nearly at the breaking point, with cracks spreading and ice peeling away twice as fast as it was a year ago.
Thwaites has been in trouble for decades. Since the 1980s, warm ocean water has been eating away at its underside, melting the glacier from beneath and forcing it to retreat. In the three decades since the early 1990s, it has lost more than 12 miles of ground. The ice shelf that remains is what's holding the larger glacier in check—think of it as a buttress propping up a wall. As long as it stands, it slows the flow of ice into the sea. Without that support, the glacier can accelerate dramatically, dumping more land ice into the ocean and raising global sea levels. Robert Larter, a glaciologist with the British Antarctic Survey, put it plainly: the last bit of ice shelf in front of the glacier is poised to disintegrate, and it's definitely going to go.
The mechanism driving this collapse is climate change, though the details remain debated among scientists. Warm, salty water from the deep ocean is being driven up underneath the shelf, likely because winds in the Southern Hemisphere are changing—a pattern linked to human-driven climate change. Larter acknowledged the uncertainty in the specifics but was clear on the broader picture: there is little doubt that human activity is a significant part of what is happening. The glacier is already losing hundreds of billions of tons of ice every year. One recent study estimated it could be losing as much as 200 billion tons annually by 2067.
What happens when the ice shelf breaks? The answer is both reassuring and terrifying. The shelf itself is already floating, so its collapse won't cause an immediate, catastrophic flood. But it removes the only thing slowing Thwaites' descent into the ocean. Once that buttress is gone, the glacier will accelerate, and the consequences will be felt across the world. If Thwaites alone collapses, global sea levels would rise by approximately 2.1 feet—enough to flood parts of cities from Miami to Mumbai. But Thwaites is not isolated. It is the widest glacier on Earth, stretching over 75 miles across and more than 6,500 feet thick in places. If it goes, neighboring glaciers could follow. The entire West Antarctic ice sheet could be in play, which would trigger another massive jump in sea level—over 10 feet—enough to redraw coastlines completely.
The timeline remains uncertain. Glacier modeling is imprecise work, and every year brings new data that shifts the projections. Scientists don't know exactly when full collapse might occur—it could take decades, centuries, or longer. But the uncertainty doesn't diminish the stakes. Low-lying nations like Bangladesh, the Maldives, and Pacific island states face flooding, contaminated freshwater supplies, and mass displacement. Major cities are vulnerable too: higher storm surges in Miami and Jakarta, more frequent floods in New York and Shanghai, mounting challenges even for places with sophisticated sea walls, like the Netherlands. The effects won't stay locked in Antarctica. What's happening at the bottom of the planet will shape the lives of people thousands of miles away, whether in the near future or not far enough from now.
Notable Quotes
The last bit of ice shelf in front of the glacier is poised to disintegrate. We don't know exactly how it will break up, but it's definitely going to go.— Robert Larter, British Antarctic Survey glaciologist
There's little doubt that human-driven climate change is a big part of what we're seeing.— Robert Larter
The Hearth Conversation Another angle on the story
So the ice shelf breaking—that's not the actual disaster, is it?
Right. The shelf is already floating, so it doesn't raise sea levels by itself. It's more like removing a cork from a bottle. Once it's gone, everything behind it moves faster.
And that's Thwaites itself—the glacier on land.
Exactly. The glacier is sitting on bedrock. When it flows into the ocean, it displaces water, and that's what raises sea levels. The shelf was slowing that flow down.
How fast could it actually move if the shelf breaks?
We don't know precisely. That's part of what makes this so uncertain. But the satellite data shows the shelf is already weakening rapidly—ice peeling away twice as fast as a year ago.
And if it's not just Thwaites? If other glaciers collapse too?
Then you're looking at over 10 feet of sea level rise. That's not a flood here and there. That's redrawing coastlines. That's displacing millions of people.
Is this definitely climate change, or could it be natural variation?
The warming water driving the melt is being pushed up by changing wind patterns in the Southern Hemisphere. Those wind changes are linked to climate change. Scientists say there's little doubt human activity is a big part of what's happening.