New report on climate ‘overshoot’: What it means for Africa and how faster action can limit the damage
A new UN report on climate "overshoot" — temporarily exceeding the Paris Agreement's 1.5°C warming limit before temperatures are brought back down — projects severe consequences for Africa if global emissions are not cut rapidly.
Even under relatively optimistic emissions scenarios, global temperatures are projected to peak around 1.8°C before any decline, with some pathways exceeding 2°C.
West and Central Africa are flagged as especially vulnerable, with modelling suggesting over 60% of urban populations could face strong or extreme heat stress by the late century, and some regions experiencing 250–300 heatwave days a year between 2065 and 2100.
The report calls for rapid emissions cuts by major emitters, scaled-up climate finance and technology transfer to Africa, and stronger early-warning and adaptation systems across health, agriculture, water and energy sectors.
Climate "Overshoot" — IPCC Definition and Pathways
"Overshoot" describes a temperature trajectory in which global warming temporarily exceeds a stated target — here, the Paris Agreement's 1.5°C limit — before being brought back down through large-scale mitigation and carbon removal, rather than warming being held below the target throughout.
Key Details
- The IPCC's Sixth Assessment Report (AR6) distinguishes "limited overshoot" (exceeding 1.5°C by up to about 0.1°C) from "high overshoot" (exceeding it by 0.1–0.3°C) for a period before decline.
- The IPCC's 2023 Synthesis Report states that limiting warming to 1.5°C with no or limited overshoot requires global GHG emissions to peak before 2025 and fall by roughly 43% by 2030 and around 60% by 2035, relative to 2019 levels.
- Overshoot pathways typically rely on large-scale Carbon Dioxide Removal (CDR) — afforestation, Bioenergy with Carbon Capture and Storage (BECCS), and Direct Air Capture — to bring temperatures back down after the peak, raising feasibility and equity concerns given the scale of removal required.
- Even a temporary overshoot risks triggering "tipping points" (e.g., coral reef die-off, ice-sheet destabilisation) that may not reverse even if temperatures later fall — a key distinction between overshoot and a scenario where the 1.5°C threshold is never crossed.
The report's core warning is precisely this asymmetry: the "overshoot" period itself — not just the eventual peak — can lock in irreversible damage for the most exposed regions, of which Africa is presented as a leading example.
Paris Agreement 1.5°C Goal and the Global Stocktake
The 1.5°C figure being "overshot" is the aspirational upper-ambition target of the 2015 Paris Agreement (adopted at COP21), which commits parties to hold warming "well below 2°C" while "pursuing efforts" to limit it to 1.5°C above pre-industrial levels.
Key Details
- Paris Agreement adopted: December 2015, COP21; entered into force: November 2016.
- The first Global Stocktake — the Paris Agreement's five-yearly mechanism to assess collective progress toward its temperature goals — concluded at COP28 (Dubai, 2023), resulting in the "UAE Consensus," which explicitly referenced the need to keep 1.5°C "within reach."
- The principle of Common but Differentiated Responsibilities and Respective Capabilities (CBDR-RC), under UNFCCC Article 3, underpins Africa's position that high-emitting industrialised nations bear primary responsibility for the emissions cuts needed to avoid or limit overshoot.
- Nationally Determined Contributions (NDCs) are the Paris Agreement's core national commitment instrument; a new, tighter round of NDCs aligned with the 1.5°C pathway was due from parties by 2025.
The report frames "faster action" explicitly in Paris Agreement terms — deeper NDC ambition and emissions cuts by major emitters are what determine how high the overshoot peaks and how long it persists, directly shaping the severity of Africa-specific impacts described in the report.
Loss and Damage Fund and Climate Finance for Africa
The report's call for climate finance for Africa connects to the institutional mechanism most directly designed to address the kind of severe, sometimes irreversible harm ("loss and damage") that overshoot scenarios threaten to cause.
Key Details
- The Loss and Damage Fund was formally established at COP27 (Sharm el-Sheikh, Egypt, 2022) and operationalised at COP28 (2023), with initial pledges around $661 million — widely assessed by African and vulnerable-country negotiators as far short of estimated needs.
- Africa contributes only around 3.8% of global greenhouse gas emissions but is repeatedly assessed (including by the WMO and UNFCCC) as one of the regions most vulnerable to climate impacts, illustrating the CBDR-RC rationale for finance transfers.
- The Global Goal on Adaptation (GGA), a Paris Agreement framework (Article 7) to enhance adaptive capacity and resilience, was given a set of target indicators at COP28 and remains the main multilateral track for adaptation finance and planning distinct from mitigation finance.
- India's own position at UNFCCC negotiations has consistently supported CBDR-RC and stronger climate finance commitments from developed countries, aligning with the finance demands the report raises on Africa's behalf.
The report's prescription — climate finance plus adaptation investment — maps directly onto the Loss and Damage Fund and Global Goal on Adaptation tracks, both still under-resourced relative to the scale of harm an overshoot scenario would inflict on low-emitting, high-vulnerability regions like Africa.
- Report released: UN "Limiting Overshoot" report, September 2026.
- Projected temperature peak even under favourable scenarios: around 1.8°C, with some pathways exceeding 2°C, before any decline toward 1.5°C.
- West/Central Africa: over 60% of urban populations projected to face strong/extreme heat stress by late century; 250–300 heatwave days/year projected in parts of Africa (2065–2100).
- Africa's share of global GHG emissions: approximately 3.8%.
- IPCC AR6: 1.5°C pathway requires emissions to peak before 2025, fall ~43% by 2030 and ~60% by 2035 (vs. 2019 levels).
- Loss and Damage Fund: established COP27 (2022), operationalised COP28 (2023); initial pledges around $661 million.