In November 2025, Iceland’s Minister for the Environment, Energy and Climate publicly described the potential collapse of the Atlantic Meridional Overturning Circulation (AMOC) as a national security concern. It made headlines around the world. Reuters, CNN, and dozens of international outlets carried the minister’s remarks, prompting commentary from researchers and governments alike. It was not the first time the AMOC had captured public attention. But this time was different.
What made the Iceland story remarkable was not the risk of AMOC collapse itself, but how that risk was framed. A government minister was speaking publicly about the potential collapse not just in terms of scientific knowledge, but also as a matter of national vulnerability and strategic concern.
That is unusual. And it points to a shift in how governments are beginning to reference the AMOC in their own documents and planning processes.
In this article, we explore this shift. We don’t attempt to catalogue every instance of such references. Instead, we explore how the discourse on AMOC risk is increasingly moving from the domain of science into a wider government context, including national security. Our goal is to understand what this shift might mean for how governments handle deep climate uncertainty and its huge governance implications.
Scientific assessment
For decades, if AMOC risk was mentioned in government documents, it has mostly been in the context of scientific assessment. These documents include national climate-risk assessments, meteorological agency reports, technical modelling summaries, and other publications from scientific research agencies. These form the evidence base from which policy advisors and the other conduits to senior decision-makers can draw.
Because of this role, these documents follow the norms of scientific assessment, which are often concerned with false positives: predicting something that fails to occur and therefore might eventually be considered a false alarm. This means their language emphasises uncertainty, confidence levels and model disagreement through formulations such as “low probability,” “medium confidence” or “low agreement among models.” So, uncertain-probability, high-impact events - like AMOC collapse - are characterised in terms of analytical uncertainties, something to be explored rather than to trigger a response.
For example, in the UK, the independent input into the most recent government Climate Change Risk Assessment discusses AMOC implications for agriculture and seasonal climate and frames these within IPCC uncertainty conventions. The 2025 U.S. Department of Energy climate impacts review similarly acknowledges the long-term trend of AMOC weakening while emphasising uncertainties in rate and magnitude. And when the Dutch meteorological institute (KNMI) updated its communication in 2025 to reflect new long-horizon modelling of AMOC instability, the message remained firmly rooted in scientific explanation, without extending into governance or preparedness implications.
Taken together, these assessment-oriented mentions form the traditional domain in which AMOC risk has appeared: essential for understanding the physical system but distant from political decision-making, strategic foresight, and institutional design.
Growing concern
Recently, AMOC risk has begun to appear in public-facing executive communication: statements, briefings, and press releases intended to shape political understanding of climate risk. These go beyond scientific assessment and into agenda-setting for governance. This operates on two levels.
1. Domestic political agenda-setting. Some senior politicians have used AMOC-related messaging to frame climate disruption as a matter of national concern and societal vulnerability. For example, in a 2024 briefing to Ireland’s cabinet, the Minister for the Environment, Climate and Communications argued that AMOC collapse is the country’s greatest climate risk, drawing on research from the Irish Environmental Protection Agency to reference temperature shocks, energy implications, and agricultural impacts. This went beyond technical assessment, anchoring AMOC risk within the political frame of national vulnerability.
2. International signalling and coalition-building. Beyond the domestic, executive statements of concern in one country might impact the perception of others. Iceland’s public framing of an AMOC collapse as a national security threat in 2025 - issued by the Minister for the Environment, Energy and Climate and linked to the National Security Council - did precisely this. This has influenced the perception of risk among other governments and given greater impetus for them to reflect on the implications of AMOC risk in their context. In turn, this might yield more momentum toward multilateral engagement on the topic.
AMOC and Governance
In parallel with the rise of public executive signalling, a second development is taking place: AMOC disruption is beginning to feature in the discourse around government planning and security frameworks, where the objective is not just communication but also anticipatory analysis. Here, the AMOC is treated as a plausible driver of systemic disruption, even when probabilities remain uncertain. Examples include:
Finland (2025): Integrating AMOC into executive foresight. Finland’s Report on the Future (2025) - a flagship foresight document issued by the Prime Minister’s Office and submitted to Parliament - situates AMOC weakening within long-range societal scenarios. The report explores implications for energy systems, infrastructure, agricultural productivity, and regional stability. Its purpose is to inform executive-level thinking about plausible disruptive futures, reflecting Finland’s longstanding practice of integrating systemic risks into its strategic planning architecture.
Germany (2025): National risk assessment with intelligence community involvement. Germany’s National Interdisciplinary Climate Risk Assessment (2025), developed with input from the Federal Intelligence Service, notes the possibility of crossing an AMOC tipping point within relevant planning horizons. The assessment highlights potentially enormous socio-economic consequences while acknowledging unresolved scientific uncertainties.
France (2025): A comprehensive cascade-risk framing in defence foresight. France’s Observatoire Défense & Climat goes further still. It’s 2025 note for the Ministry of Armed Forces not only recognises AMOC collapse as a potential systemic shock, but embeds it within a structured cascade framework that situates the AMOC within France’s wider risk-management portfolio. The analysis begins with first-order physical impacts - such as pronounced North Atlantic cooling, altered precipitation patterns, extreme winter conditions, and the broader disruption of oceanic circulation. It then traces second-order socio-economic effects, including agricultural instability, strained supply chains, surging winter energy demand, and disruption to maritime and fisheries activity. Finally, it outlines third-order geopolitical and security consequences, ranging from intensified migration pressures and destabilisation in vulnerable regions to potential strains on European cohesion and increased demand for military humanitarian assistance. In this framing, an AMOC collapse is not treated as an isolated physical event but as a catalyst for cascading failures across food, energy, infrastructure, and security systems.
This note also advances a set of concrete institutional proposals. It recommends establishing a dedicated tipping point monitoring function within strategic or naval oceanographic bodies; commissioning studies on socio-economic cascades triggered by climate tipping points; and formally integrating AMOC and other tipping elements into RED TEAM and RADAR strategic-stress-testing exercises. These are not scientific recommendations but governance design recommendations, indicating the growing discourse in the French defence community on climate tipping points as objects of strategic planning rather than distant research questions.
The UK (2024–2025): Building anticipatory capability through ARIA’s “Forecasting Tipping Points” programme. The UK has approached tipping point governance through anticipatory innovation. ARIA’s programme (launched 2024–2025) is a government-backed effort to develop early warning capabilities for critical Earth system thresholds. Although not framed publicly as an “AMOC programme,” its scientific focus includes some of the most consequential precursor systems for AMOC stability, like the Subpolar Gyre, whose circulation structure conditions heat and salinity transport into the deep-water formation regions. These dynamics play a central role in shaping the AMOC’s future trajectory.
ARIA’s mandate also extends beyond physical detection. The programme is explicitly exploring the governance question of how states might interpret and act upon credible early-warning signals, recognising that the value of such signals depends on institutional capacity to respond under deep uncertainty. In this sense, ARIA represents a distinct strand of preparedness: not a risk assessment or a public policy statement but an investment in the capability infrastructure governments may require for future AMOC-related and other tipping-point governance challenges.
Why This Shift Matters
Taken together, these developments suggest that the AMOC is beginning to migrate from the domain of scientific assessment into the domain of governance. Public executive communication signals this shift outwardly. In Ireland and Iceland, the AMOC is presented not just as a question of science but also as a risk with societal, geopolitical, and diplomatic implications. These are acts of political agenda-setting: domestically, by shaping national perceptions of vulnerability; and internationally, by essentially inviting other states to treat tipping point risks as legitimate strategic concerns.
Within government planning and security institutions, the shift is clearer. When organisations in Finland, Germany and France incorporate AMOC disruption into foresight exercises and security-focused risk assessments, they are no longer just asking the scientific questions of when or whether a collapse might occur. They are also grappling with governance questions: if such a systemic climatic shift were to occur, how would it cascade through energy, food, infrastructure, economic, and geopolitical systems, and what institutional capacities would be required? This reflects a growing recognition that some climate risks must be treated as policy-relevant uncertainties, worthy of a response even when probabilities remain unresolved.
A third development is also emerging: anticipatory-innovation infrastructures such as the UK’s ARIA programme. By investing in early-warning capability for critical Earth system thresholds - including precursor dynamics relevant to AMOC stability - ARIA is not producing risk assessments or political signals, but building the tools and interpretive capacity that governments may eventually rely upon when facing deep uncertainty. This represents a different but complementary form of institutional response: a shift from monitoring what might happen to building the capability to respond if it does.
Security and strategic foresight communities are, in many ways, stepping into a space that climate-policy processes have often been reluctant to enter: acting in response to systemic shocks under deep uncertainty. These communities are accustomed to working with uncertain-probability, high-impact events. They do not require scientific certainty to justify a response and are used to designing institutions and capabilities around incomplete information. Yet we are still a long way from these efforts having a significant impact on planning and intergovernmental planning.
Conclusion
The AMOC has long appeared in scientific assessments and climate-risk reports, but the contexts in which governments reference it are beginning to broaden. Over the past two years, the AMOC has entered public executive discourse, strategic foresight, and even the discourse around defence analysis. These developments do not indicate consensus on timing or probability. Rather, they reveal a shift in how some governments are starting to conceptualise tipping points: not solely as scientific uncertainties, but as governance challenges with cascading societal and geopolitical implications.
It is possible that we are witnessing the early stages of a broader transformation in how governments approach tipping point risk. The recent examples from Ireland, Iceland, Finland, Germany, France, and the UK may not be isolated anomalies, but indicators that the governance conversation is shifting toward a frame in which tipping points are treated as plausible risks over planning horizons, relevant for foresight, preparedness, and international dialogue.
Whether this shift continues remains to be seen. But the expansion of the discourse on AMOC risk suggests that at least some states are beginning to reinterpret deep climate uncertainty as a matter not only for scientific monitoring, but for political responsibility and strategic planning. In this sense, the governance system may be approaching its own tipping point: a point at which climate tipping risks move from the margins of assessment to the foreground of institutional imagination.
Páll Gunnarsson is the Executive Director of the Reykjavik Institute.
Ben Shread-Hewitt is a researcher at the Strategic Climate Risks Initiative.
Good job in shedding light on these important shifts in acknowledgement of dire developments. Once again Europe seems to lead the way. But Karma works and eventually the people in the US will realize you can't wish away reality. Shifts toward totalitarianism can be seen as future proofing crowd control when panic surfaces.
To be fair, Ireland and Iceland will be hit hard without complete AMOC collapse. Many believe parts of it will move to Polar Circulation for Norway at least. But the Cold Blob south of Greenland is a big threat to the Icelandic Low. Ireland and parts of the UK may end up failing to act before a tipping point. Personally suspect this El Nino to be the second warning shot. The system that give Bergen 200 rain days mostly during winter may turn south. They complain too much to know what may hit them.
As for fisheries in the Atlantic, AMOC going may not be bad, it's the North Sea circulation that is important. Many fish stocks navigate by ocean temperature and could go further south, which would be good. No doomsday on this front, perhaps cod could recover in Canada if it finds its way. But for the US coast and Caribbean it will be a disaster. And might be debatable for Iceland, with the warm and humid low pressure system, depending on what will take its place. But without AMOC ut could get permafrost cold.