The world is poised to breach its most critical climate threshold within the next decade, a United Nations report warns — a development that carries profound implications for the insurance industry, already strained by mounting losses from climate-driven disasters.
According to the Emissions Gap Report 2025 released by the UN Environment Programme (UNEP), the planet is now on track for average global warming of between 2.3 and 2.5 degrees Celsius this century — a modest improvement from last year’s projection but still well beyond the Paris Agreement’s central aim of holding warming to 1.5 degrees. Even with full implementation of countries’ existing pledges, scientists say the 1.5 °C limit will be surpassed, at least temporarily, in the early 2030s.
“This will be difficult to reverse,” the UNEP report said, “requiring faster and bigger additional reductions in greenhouse gas emissions to minimize overshoot.”
The message from UN officials was unambiguous. “Scientists tell us that a temporary overshoot above 1.5 degrees is now inevitable,” Secretary-General António Guterres said in a statement accompanying the report. “The path to a livable future gets steeper by the day.”
Inger Andersen, UNEP’s Executive Director, said the world’s efforts have repeatedly fallen short. “Nations have had three attempts to deliver promises made under the Paris Agreement, and each time they have landed off target,” she said.
For insurers and reinsurers, the findings signal a world of deepening physical and financial risk. Global greenhouse gas emissions rose 2.3 per cent in 2024 to 57.7 gigatons of CO₂ equivalent, underscoring the widening gap between ambition and action. Every fraction of a degree of additional warming is expected to amplify loss frequency and severity across property, casualty, and specialty lines.
Already, insurers are facing unprecedented losses from weather-related disasters. In Canada, wildfires, floods, and severe storms have repeatedly breached records for insured damages. Internationally, hurricanes and typhoons — energised by warmer oceans — have intensified at an alarming pace. A recent peer-reviewed study found that roughly four out of five Atlantic hurricanes between 2019 and 2023 reached intensities roughly one category higher than would have occurred under cooler ocean conditions.
Such dynamics are eroding the assumptions underpinning catastrophe models. Storms are forming and strengthening faster, leaving less time for evacuation or mitigation, while losses from flooding and coastal surge are compounding. For underwriters and reinsurers, that means revisiting pricing, capital reserves, and exposure management — and for some, pulling back from high-risk zones altogether.
The UNEP report arrives ahead of the COP30 climate summit, where negotiators are expected to face renewed scrutiny over faltering progress. Only about one-third of the Paris Agreement’s signatories submitted new national climate plans by the end of September, covering roughly 63 per cent of global emissions.
Even if all pledges were met — a generous assumption given current policy trajectories — projected warming would still far exceed safe limits. Current policies alone would result in temperatures climbing as high as 2.8 °C, the report said.
Ten years after the signing of the Paris Agreement, global temperatures have already risen about 1.2 °C above pre-industrial levels. The UNEP notes that, while technological advances in renewable energy and methane reduction have lowered long-term forecasts from the 3 °C to 3.5 °C range of a decade ago, progress has been incremental and fragile.
The planned withdrawal of the United States from the Paris framework is expected to erase roughly 0.1 °C of the recent improvement, leaving global mitigation efforts largely stalled.
For the insurance industry — a key pillar of the global financial system — these trends represent both a risk and an opportunity. Rising climate losses have already driven up premiums across much of North America, while some regions are becoming uninsurable. Reinsurers are tightening capacity, pushing more costs onto primary carriers and policyholders.
At the same time, insurers are emerging as pivotal players in financing adaptation and resilience. Through green investment portfolios, catastrophe bonds, and climate-risk analytics, the sector is increasingly being called upon to bridge the divide between protection and prevention.
Canadian regulators, led by the Office of the Superintendent of Financial Institutions (OSFI), have begun requiring major insurers to conduct climate-scenario stress tests — exercises that now seem less hypothetical and more immediate. A world that overshoots 1.5 °C will bring not only more destructive physical events, but also transition shocks as governments scramble to cut emissions and investors reprice carbon-intensive assets.
The UNEP report underscores that limiting the temperature overshoot — even temporarily — will require emissions cuts of 40 per cent from 2019 levels by 2030. At present, nations are on track for reductions of about 15 per cent by 2035. “While national climate plans have delivered some progress, it is nowhere near fast enough,” Ms. Andersen said.
For the insurance community, that gap between ambition and reality is the space where claims, losses, and capital pressures accumulate. Each incremental rise in global temperature increases the probability of catastrophic events — whether the floods that swept through British Columbia, the droughts that disrupted prairie agriculture, or the hurricanes that now strengthen almost overnight in the Atlantic basin.
In a world moving toward 2.5 degrees of warming, insurers will be forced to do what policymakers have not: plan for a permanently riskier climate.
