UNEP Limiting Overshoot Report: From Preventing 1.5°C Breach to Minimising Peak Warming and Returning Below the Threshold Category GS Date Data rule Climate Change, Environment and International GS Paper III 4 September 2026 30+ numerical facts Governance
WHY IN NEWS
- UNEP's Limiting Overshoot report, released on 2 September 2026 and widely discussed on 4 September, states that exceeding 1.5°C is now widely assessed as unavoidable under current and alternative near-term pathways.
- The report reframes climate strategy around an "overshoot, peak and decline" pathway: keep peak warming as low as possible, shorten the time above 1.5°C and return below the threshold through deep emissions cuts and eventual net-negative CO2.
- Its best-case scenario places peak warming around 1.8°C, while current policies point to roughly 2.6°C by 2100, with substantial uncertainty.
- For UPSC, the report links the Paris Agreement, mitigation, adaptation, carbon dioxide removal, methane control, tipping points, climate justice and limits to adaptation.
TOP DATA & FACTS FOR UPSC
- Report date: 2 September 2026.
- Paris temperature benchmark: 1.5°C above pre-industrial levels.
- Best-case peak warming cited: about 1.8°**C.
- Current-policy warming cited**: about 2.6°C by 2100.
- A reported current-policy range extends roughly 1.9-3.6°C.
- The Paris Agreement was adopted in 2015.
- In 2024, the world experienced the first calendar year with average temperature above 1.5°C, though long-term climate thresholds use multi-year averages.
- The report emphasises an overshoot, peak and decline sequence of 3 stages.
- Some scenarios indicate glacier mass loss exceeding 25% globally by 2100 under higher warming.
- Food-production declines of up to about 14% by 2050 are cited without effective adaptation in relevant risk assessments.