The world has lost the chance to keep global warming below 1.5°C without an overshoot, the United Nations Environment Programme says—but the climate future is not reduced to a choice between perfection and disaster. UNEP’s new Emissions Gap Report 2026 argues that the immediate task is to make the overshoot as small and short-lived as possible, then work toward returning temperatures to 1.5°C by the end of the century.
That is a grim adjustment to the promise made in the 2015 Paris Agreement, whose central temperature goal is to hold warming well below 2°C while pursuing efforts to limit it to 1.5°C. The threshold was never intended to mark a sudden cliff where every climate impact begins, but each additional fraction of a degree increases risks to ecosystems, food systems, human health and coastal communities. The latest assessment recognizes that the timing of the breach now matters almost as much as the eventual peak.
UNEP’s “lowest possible” overshoot pathway would see warming peak at roughly 1.7°C to 1.8°C around mid-century before declining to 1.5°C or below by 2100, with about a 50 percent chance of success. Reaching even that constrained outcome would require global greenhouse-gas emissions to fall 18 percent by 2030, 45 percent by 2035 and 69 percent by 2040, measured against 2025 levels. Current national climate plans fall far short of those benchmarks.
The arithmetic also forces carbon removal into the center of climate policy. UNEP estimates that approximately 320 gigatonnes of carbon dioxide would need to be removed from the atmosphere and permanently stored during this century—about eight years of global carbon dioxide emissions at 2024 levels. That could involve forests, soils and other nature-based approaches alongside engineered systems such as direct-air capture, but removal is expensive, energy-intensive and difficult to scale without competing for land, water and clean energy.
Crucially, carbon removal is not a substitute for cutting fossil-fuel pollution now. Delaying reductions would push the peak higher, extend the period of dangerous warming and increase dependence on technologies that remain limited today. Current policies are still associated with warming of up to 2.8°C this century, while UNEP says faster progress is possible by expanding renewables, improving energy efficiency, cutting methane and reducing reliance on coal, oil and gas.
For the public, the message is less “the target no longer matters” than “the target has changed shape.” Every tenth of a degree avoided means less damage, and a brief overshoot would be safer than a prolonged one. The UN’s acknowledgement that 1.5°C will be exceeded therefore marks a political and scientific reckoning, not permission to stop acting. The next test will be whether governments turn UNEP’s steep deadlines into enforceable policies before the remaining room to limit the peak disappears.
