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The Gulf Stream, an oceanic system that transports heat from the tropics to Europe and the east coast of North America, continues to lose strength, and scientists have stopped debating whether the collapse will happen to start calculating how to prevent it. According to information from Xataka, among the most radical proposals under analysis are the closure of the Bering Strait with a dam, the launch of orbital sunshades to cool the Arctic, and the fertilization of the Atlantic Ocean with millions of tons of iron.
The most recent of these proposals revives an idea from a Soviet engineer from the 1950s: to build a dam in the Bering Strait, the 85-kilometer channel that separates Russia from Alaska, to interrupt the flow of water from the Pacific to the Arctic. Climatologists did the calculations and concluded that interrupting this flow would encourage the formation of deep waters in the North Atlantic due to the difference in salinity, reinforcing exactly the mechanism that keeps the Gulf Stream functioning. The problem is that the proposal only works while the Gulf Stream is still transporting salt northward: if it has already weakened too much when the dam is built, the effect would be the opposite, plunging the Northern Hemisphere into an even harsher winter. It’s the kind of scenario where the margin between solution and catastrophe depends on timing, and where getting the timing wrong can be irreversible.
What is the Gulf Stream and why it matters
The technical name is Atlantic Meridional Overturning Circulation, known by the acronym AMOC. In practice, the Gulf Stream is an ocean circulation system that functions like a conveyor belt of heat: warm, salty water flows across the surface of the Atlantic from the tropics to the coasts of Europe and North America, warming the climate of these regions. When this water reaches the North Atlantic, it cools, becomes denser, and sinks to the ocean floor, flowing back southward at depth and completing the cycle.
It is this heat transfer that allows cities like London, Paris, and Berlin to have bearable winters, despite being at the same latitude as the frozen regions of Canada. Without the Gulf Stream, Western Europe would have average winter temperatures up to 10 degrees lower than they are now, which would transform the continent’s agriculture, infrastructure, and economy. The mechanism depends on the temperature and salinity difference between tropical waters and North Atlantic waters: if this difference decreases, the current weakens.
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Why the Gulf Stream is losing strength
The weakening of the Gulf Stream is directly linked to the melting of the Arctic and Greenland. When the ice melts, it releases large volumes of fresh water into the North Atlantic, diluting the salinity of the water that should sink because it is cold and dense. With the water being less salty and therefore less dense, the sinking mechanism loses intensity, and the “conveyor belt” that pulls warm water from the tropics slows down.
Recent measurements show that the AMOC is at its weakest level in at least a thousand years, and climate models indicate that the weakening could accelerate in the coming decades if greenhouse gas emissions are not drastically reduced. Some studies suggest that there is a tipping point beyond which the current would collapse abruptly and irreversibly, transforming the climate of the Northern Hemisphere in a matter of decades. It is this possibility that has led scientists to abandon the stance of merely warning and start proposing direct interventions in the climate system.
Closing the Bering Strait: the proposal from 1950
The most surprising idea among the proposals to save the Gulf Stream is the construction of a dam in the Bering Strait, the channel that separates Russian Siberia from American Alaska. The original concept was from a Soviet engineer in the 1950s, and contemporary climatologists have revisited it to calculate whether interrupting the flow of water from the Pacific to the Arctic could strengthen the formation of deep waters in the North Atlantic, the mechanism that keeps the Gulf Stream active.
The calculations show that, in theory, it makes sense: blocking the entry of Pacific water would alter the Arctic’s salinity in a way that encourages the sinking of dense water in the North Atlantic. But the authors themselves acknowledge that the proposal only works as long as the AMOC is still operating with enough strength to transport salt north. If the current has already weakened beyond a critical limit, the dam would have the opposite effect. In engineering terms, the Bering Strait is about 85 kilometers wide, and there are already dikes in the world with half that length, such as the Saemangeum Seawall in South Korea, which is 33 kilometers long. It is technically possible, but politically and ecologically devastating.
Orbital Sunshades and Iron in the Ocean: Other Proposals
Closing the Bering Strait is not the only extreme proposal under discussion. Scientists are also considering the launch of orbital sunshades into space, gigantic structures positioned between the Earth and the Sun to reduce the amount of solar radiation reaching the Arctic and slow down the melting. The idea is that, with less heat reaching the pole, the fresh water released by the melting would decrease and the Gulf Stream would regain strength due to less dilution in the salinity of the North Atlantic.
Another line of research proposes fertilizing the ocean with millions of tons of iron. Iron stimulates the growth of phytoplankton, microscopic organisms that absorb carbon dioxide during photosynthesis. In theory, massively increasing the phytoplankton population in the Atlantic would remove carbon from the atmosphere, slow global warming, and consequently reduce the melting that weakens the Gulf Stream. In practice, dumping millions of tons of iron into the ocean could cause unpredictable ecological imbalances, such as toxic algae blooms and dead zones due to oxygen depletion.
The Consequences of a Gulf Stream Collapse
If the Gulf Stream collapses, the consequences for the Northern Hemisphere would be catastrophic. Western Europe would experience temperature drops that would transform the climate of countries like the United Kingdom, France, Germany, and Scandinavia into something comparable to northern Canada. Entire crops would be compromised, residential and industrial heating systems would be overloaded, and urban infrastructures designed for the current climate would become inadequate.
The impacts would not be limited to Europe. The east coast of North America would also lose the moderating effect of the current, and changes in ocean circulation patterns would affect currents worldwide, altering rainfall regimes in Africa, Asia, and South America. Sea levels would rise unevenly, with greater elevation in the North Atlantic where the current would no longer “pull” water away from the coast. Cities like New York, Boston, and Miami would face permanent flooding that current projections do not account for.
Taking Control of the Planet or Accepting the Consequences
The proposals to save the Gulf Stream reveal a dilemma that humanity will increasingly face in the coming years: directly intervening in Earth’s climate system or accepting the consequences of not doing so. Closing the Bering Strait, launching sunshades into space, and fertilizing the ocean with iron are ideas that a generation ago would have been dismissed as science fiction. Today, climatologists are making detailed calculations about their feasibility because the cost of inaction may be greater than the risk of acting wrongly.
None of these proposals replace the reduction of greenhouse gas emissions, which remains the most effective measure to slow down the weakening of the Gulf Stream. But the speed at which the AMOC is losing strength suggests that cutting emissions alone may not be enough. The question scientists are asking is no longer “should we intervene in the climate?”, but “when and how to intervene without creating problems worse than those we are trying to solve?”.
The Gulf Stream, a dam, and the future of the climate
The Gulf Stream continues to weaken and scientists are testing scenarios that include closing the Bering Strait with a dam, launching orbital sunshades, and fertilizing the ocean with iron. None of these proposals are consensual, all present collateral risks, and the most promising one only works if implemented before the current crosses the point of no return. What is at stake is the climate of the entire Northern Hemisphere, European agriculture, sea levels on American coasts, and the stability of ecosystems that support billions of people.
Do you think humanity should directly intervene in the climate system to save the Gulf Stream? Tell us in the comments what you think about closing the Bering Strait, whether orbital sunshades are science fiction or a future necessity, and if you believe the collapse of the AMOC can really happen. We want to hear your opinion.
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