UNEP's 2026 Emissions Gap Report: The 1.5°C Target Is Lost, and COP31 Must Face It

The United Nations has finally said the sentence it spent a decade avoiding. In its Emissions Gap Report 2026, published on October 21 and titled "The Point of Return," the UN Environment Programme states that the opportunity to limit global warming to 1.5°C with no or limited overshoot has been lost. Exceeding the Paris Agreement's most famous threshold is now, in the report's words, imminent and unavoidable. The question is no longer whether we cross 1.5°C, but by how much, for how long, and whether we can come back.

The numbers behind that sentence are stark, and they deserve to be read plainly rather than softened. Global greenhouse gas emissions reached an estimated 58.4 billion tonnes of CO2 equivalent in 2025, broadly unchanged from the year before, and UNEP cautions that it is too early to declare a peak. Under current policies, the world is heading for about 2.8°C of warming this century. If every country fully implements its latest climate pledge, that falls only to 2.6°C. Even adding all announced net-zero targets gets to 2.1°C. The report's best remaining path — the "lowest overshoot" scenario — peaks at 1.7 to 1.8°C around mid-century and returns to 1.5°C by 2100, but it demands emissions cuts of 18 percent by 2030, 45 percent by 2035, and 69 percent by 2040, relative to 2025 levels: close to 6 percent every single year until 2035. Current pledges, fully delivered, would manage only 5 to 8 percent by 2030. The gap between promise and requirement is 5 billion tonnes in 2030 and 16 billion tonnes in 2035. And the return journey itself depends on removing roughly 320 billion tonnes of CO2 from the atmosphere over the century, at a scale no technology has yet demonstrated.

None of this means the last decade of climate policy achieved nothing, and the report is careful to say so. Emissions fell in 63 countries between 2016 and 2025. Solar and wind prevented 4.1 billion tonnes of CO2 in 2025 alone, and renewable capacity additions ran three times the level anticipated in 2015, with solar seven times expectations. Earlier this month the International Energy Agency confirmed that renewables have passed coal as the world's largest source of electricity. The clean energy transition is real, and it is winning on cost. It is simply not winning fast enough, because fossil fuel emissions are still rising and every year of delay raises the peak we must later climb down from.

That is the document arriving on the desks of negotiators heading to COP31, which opens in Antalya, Türkiye, on November 9. The summit has an unusual shape: Türkiye holds the presidency, while Australia leads the actual negotiations under a compromise struck after both countries bid to host. Around 100,000 visitors are expected, with a leaders' summit on November 11 and 12. The United States, the world's second-largest emitter, will not be there as a Paris Agreement party, having withdrawn, and its absence is one reason UNEP's projections worsened from last year's report. The EU arrives pushing a "mitigation package" whose most concrete demand is extending the negotiating track on emissions cuts — the mitigation work programme — to 2040, rather than a new numeric target.

Here is my judgment, and the prediction I am putting on the record with this article. COP31's final decision text will not commit parties to cuts consistent with UNEP's lowest-overshoot pathway: an 18 percent cut by 2030 against 2025 levels, or any equivalent trajectory. I put that at 70 percent. The reasons are structural, not cynical. COP decisions require consensus among nearly 200 parties, and recent summits have repeatedly failed to agree tougher action even as the science hardened; large emerging economies and fossil fuel producers resist measures they see as a cost to growth, and the United States is outside the room. The EU's own headline ask is about process — keeping a work programme alive — not about adopting UNEP's number, which tells you where the negotiable ground actually lies. The honest risks to my prediction are a leaders' summit surprise and sectoral side deals on finance or electrification that could be dressed up as a pathway commitment; that is why my criterion is strict, and why vague language about "accelerating cuts" will not count. If Antalya produces only process, the report's verdict will stand as the summit's epitaph: the gap is no longer a warning about the future. It is a measurement of the present, and it is growing.