New climate research published in 2026 points to a faster pace of warming and a less stable Atlantic Meridional Overturning Circulation than earlier models assumed. The studies, from researchers including Grant Foster, Stefan Rahmstorf, Valentin Portmann and Johan Rockström, arrive as the Institute and Faculty of Actuaries warns that conventional economic models used by finance and government understate the cost of climate tipping points. The 2023 Global Stocktake found current pledges point to around 2.5–2.9°C of warming by 2100.
Scientists still disagree on whether the recent heat is a lasting trend or a short spike. What they increasingly share is doubt about whether the models guiding policy can capture cascading failures at all.
The most consequential claim in this year’s climate research is not about the weather. It is about the maths. The Institute and Faculty of Actuaries, the professional body that prices long-term financial risk in Britain, warns that the economic models built into pension funds, insurance books and government planning systematically understate the damage from climate tipping points.
That warning lands alongside a cluster of 2026 studies arguing that warming may be speeding up and that ocean circulation in the North Atlantic is closer to a threshold than earlier work assumed. The science is contested in its details. The financial implication is not.
If the models are wrong in the direction the actuaries describe, the error is not academic. It runs through the value of coastal property, the solvency of insurers, and the assumptions inside every long-dated bond. The question is no longer only how fast the planet warms. It is whether the tools used to plan for it can see the shocks coming.
The models were built for a slower world
Start with the warming itself. A March 2026 paper in Geophysical Research Letters by Grant Foster and Stefan Rahmstorf reports that, after stripping out the effects of El Niño, volcanic ash and solar cycles, an underlying warming trend remains. According to the study, that trend has run markedly faster since 2015 than over the previous four decades. Foster’s position is that the recent heat is not solely a temporary spike.
Not everyone agrees. Michael E. Mann, Presidential Distinguished Professor at the University of Pennsylvania, maintains that the apparent jump largely reflects natural swings sitting on top of a near-linear human-caused trend. He cautions against reading a short, noisy period as a new long-term rate. James Hansen, the former NASA scientist, offers a third reading: that recent cuts to sulfur pollution from shipping and coal have removed a cooling haze and unmasked warming that was already there.
The AMOC sits at the centre of the tipping-point worry. Work led by Valentin Portmann in Science Advances concludes the circulation is closer to a critical point than once thought, with high-emissions paths showing a real chance of rapid weakening. A February 2026 One Earth study co-authored by Johan Rockström warns that current policies still point well above 2°C, with cascading feedbacks raising the odds of far worse.
The honest limit here matters. These figures come from studies not independently verified in full, and the Foster–Rahmstorf trend rests on a short window. Western consumption sits inside the mechanism all the same: EU and US demand for beef and soy drives Amazon clearing, a tipping-sensitive system, and Western capital still funds new fossil infrastructure in vulnerable regions.
Policy is reading from an older map
The gap is structural. Most climate–economic tools were calibrated on gradual change, so they handle a single heatwave better than a sequence of shocks hitting food, finance and infrastructure at once. That is the heart of the actuaries’ warning. The damage lives in the cascades the models smooth away.
Policy is lagging the science it relies on. The Paris Agreement’s 2023 Global Stocktake concluded that current pledges lead to roughly 2.5–2.9°C of warming, prompting calls for stronger 2030 targets. The OECD’s 2025 assessment of national climate action found those targets still off-track for a 1.5°C path. The Paris Agreement’s five-yearly ratchet assumes ambition rises each cycle. The new research questions whether the speed of that ratchet matches the speed of the risk.
So the loop closes where it opened. The argument among scientists over whether warming has truly accelerated is the visible debate. Beneath it sits the quieter one the actuaries have named: that the numbers used to price the future were built for a planet that changes slowly, and the planet may no longer be obliging.
Beyond the headline
The science gap
The real gap is not whether the planet warms but how poorly models capture compound extremes once a threshold is crossed. Legacy tools were tuned for gradual change, so they read a single heatwave well and a chain of shocks badly. Even modest differences in warming rate or AMOC stability can then translate into step-changes in damage the models still cannot represent.
The bigger picture
These studies mark a shift from treating climate as a slow backdrop to treating it as systemic risk. Researchers now frame the system as a network, where stress in one node — North Atlantic circulation, Amazon rainfall — spreads into food prices, migration and financial instability. For governments and insurers, that moves climate from a sustainability file into core macro-stability planning.
What isn’t being said
Public discussion rarely names how concentrated control over emissions-heavy assets shapes the risk. A small group of fossil producers, banks and asset managers influences whether high-warming paths stay plausible, yet their choices are often treated as separate from the physics. Acknowledging the link shifts focus from abstract temperature targets toward who must change business models for tipping risk to fall.
The exposure runs through your savings, not just the sky
With the IPCC scoping its next assessment in late 2026 and governments due to submit fresh targets before the 2030 Global Stocktake, the under-modelling of climate risk is now a planning problem for households, not only scientists.
- Pension and portfolio holders
Consult the transition- and physical-risk scenarios published by the Network for Greening the Financial System at ngfs.net. Central banks and supervisors use these to test how financial systems hold up under higher-warming and tipping-point paths — the same tail risks the actuaries say standard models miss.
- Concerned citizens and voters
Check how your country’s current target compares with a 1.5°C path using the Climate Action Tracker country pages at climateactiontracker.org/countries. It shows plainly whether national policy is aligned with avoiding higher tipping-point risk, ahead of the next round of pledges.
- Coastal property owners
The AMOC research carries direct weight for the US Eastern seaboard and Northwestern Europe, where weakening circulation could raise sea levels and cool conditions. Track the IPCC’s AR7 scoping decisions at ipcc.ch for whether tipping-point chapters are strengthened — a signal of how seriously mainstream assessments are now taking abrupt change.
Explainer
- AMOC
- The Atlantic Meridional Overturning Circulation, the system of ocean currents that carries warm water north and cold water south through the Atlantic. It governs much of the climate of Northwestern Europe and the North American east coast. A sharp weakening would cool parts of Europe even as the planet overall warms — one of the few climate shifts that runs against the global trend.
- Intergovernmental Panel on Climate Change
- The UN body that reviews and summarises climate science for governments, established in 1988 under the WMO and UN Environment Programme. Its assessment reports anchor international negotiations and national policy. Its seventh report, AR7, is being scoped in 2026–2027 with a mandate to cover abrupt changes and tipping elements more fully than its 2021 predecessor did.
- Global Stocktake
- The five-yearly review under the Paris Agreement that measures collective progress toward limiting warming. The first concluded in 2023 and found current pledges far short of the well-below-2°C goal. It is designed to push each country to raise ambition in its next national target, with the next stocktake due in 2028.
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