UNEP Report: 18% Emission Cut by 2030 Needed to Return to 1.5°C
UNEP's Emissions Gap Report 2026 outlines a pathway to limit peak warming to 1.7-1.8°C and return to 1.5°C by 2100, requiring steep emission cuts.
The story in focus
A new UNEP report says global emissions must fall 18% by 2030 and 45% by 2035, relative to 2025, to minimize overshoot and return to 1.5°C by 2100. Current policies put warming on track for 2.8°C.
- The lowest-overshoot scenario limits peak warming to 1.7-1.8°C around mid-century and returns to 1.5°C by 2100 with about 50% chance.
- Full implementation of current NDCs would cut emissions only 5-8% by 2030 and 11-15% by 2035, far short of the 18% and 45% needed.
- Current policies could lead to 2.8°C warming this century, while all NDCs plus net-zero targets limit warming to 2.1°C.
What the report finds
The UN Environment Programme's Emissions Gap Report 2026, released on 21 October, examines a 'lowest possible' 1.5°C overshoot scenario. In this pathway, global warming peaks at 1.7-1.8°C around mid-century and returns to or below 1.5°C by 2100, with roughly a 50 per cent chance.
To achieve this, global greenhouse gas emissions must be cut 18 per cent by 2030, 45 per cent by 2035 and 69 per cent by 2040, all compared with 2025 levels. That implies average annual reductions of 5.7 per cent from 2025 to 2035, higher than the roughly 5 per cent in previous IPCC pathways.
The gap to current plans
Full implementation of current Nationally Determined Contributions would reduce emissions by only 5-8 per cent by 2030 and 11-15 per cent by 2035, relative to 2025. With current policies, the report projects warming could reach 2.8°C this century; delivering all NDCs and similar efforts would limit warming to 2.6°C. Even with all NDCs plus net-zero targets, warming would be capped at 2.1°C.
The report attributes the worsened projections since last year to the United States' withdrawal from the Paris Agreement and revised historical emissions estimates. It also notes that the lowest-overshoot scenario would require removing and permanently storing about 320 gigatonnes of CO2 over the century, equivalent to around eight years of 2024 global CO2 emissions, though technological and socioeconomic challenges make this uncertain.
Opportunities and policy evidence
The report points to signs of progress: since the Paris Agreement, global renewable electricity capacity has grown three times faster than anticipated, with solar PV build-out seven times faster. It cites over 220 policy evaluations, finding that evaluated electricity-sector policies cut emissions by an average of 9 per cent, while economic instruments such as carbon taxes and cap-and-trade achieved reductions of 5-13 per cent across sectors.
UNEP Executive Director Inger Andersen said every additional fraction of a degree of warming increases risks, and that minimizing peak warming is possible. The report suggests the second Global Stocktake could extend quantified goals to 2035 and 2040.
What emission cuts does UNEP say are needed by 2030?
UNEP's report says global greenhouse gas emissions must fall 18 per cent by 2030 and 45 per cent by 2035, relative to 2025 levels, to follow a lowest-possible 1.5°C overshoot pathway.
Sources & further reading
Help keep the record accurate. Send a correction.
