The Atlantic’s Lifeline Could Collapse Much Sooner Than Feared

An Ocean Current That Shapes the World’s Climate

The Atlantic Meridional Overturning Circulation (Amoc) is often described as the planet’s lifeline. It carries warm water northward and sends cold water into the depths. Without this circulation, European winters would be much harsher, tropical rain belts would shift, and millions of people could lose their livelihoods.

The Risk Is Far Greater Than Previously Thought

New model studies show that the risk of collapse can no longer be considered a “low probability” event. On the contrary, 70% of simulations indicate that Amoc will break down if emissions continue as they are. Even in a scenario with modest emissions cuts, collapse occurs in 25% of cases. “We’re talking about a process that could become inevitable within 10–20 years,” says climate scientist Stefan Rahmstorf.

Consequences: Cold, Drought, and Rising Seas

A collapse would trigger a cascade of effects: Europe could be hit by unbearably cold winters and dry summers, tropical rain belts might shift, and global sea levels could rise by another half meter. According to the researchers, Amoc is already at its weakest point in 1,600 years. Observations in the North Atlantic confirm an alarming downward trend.

Hope Relies on Drastic Emissions Cuts

The only potential safeguard is rapid and deep reductions in CO₂ emissions. While the models differ in detail, the message is clear: the longer we wait, the greater the risk that the process will become self-reinforcing and irreversible. As one researcher puts it: “Even a 10% chance of collapse would be far too high.”

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