Zero emissions commitment depends on warming level

When anthropogenic CO 2 emissions cease, global temperature does not stabilize immediately.

By Gibbs, JONES, Jones +12Nature Climate ChangeNov 3, 2026

Score████░░░░░░4.4

Key numbers

5 K
2 K but becomes positive
0.6 K after 150 years

VerdictWorth a reader's time today.

Read the original

Abstract

Abstract When anthropogenic CO 2 emissions cease, global temperature does not stabilize immediately. The resulting global temperature change, the zero emissions commitment, is central to carbon budget assessments and understanding reversibility of global warming, yet its dependence on prior warming levels remains unclear. Here we show, using zero-emission simulations with the UK Earth System Model (UKESM1.2) across global warming levels of 1.5–5 K, that the zero emissions commitment stays near zero up to 2 K but becomes positive at higher warming levels, reaching 0.4–0.6 K after ~ 150 years. This dependence indicates that stabilizing or reversing warming becomes progressively more difficult as peak temperature rises. We identify the mechanism behind this behaviour: stronger warming from higher radiative disequilibrium and weakening carbon sinks, driven by saturated land carbon uptake and the reduced radiative impact of CO 2 drawdown at higher background CO 2 concentrations. Higher peak warming therefore commits the planet to additional warming, limiting temperature-overshoot reversibility.

Laura Gibbs, CHRIS D. JONES, Colin Jones, Timothy Andrews, Spencer Liddicoat, Andrew J. Wiltshire, Eddy Robertson, Richard G. Williams, L. de Mora, Jeremy P. R. B. Walton, Andrea J. Dittus, Ranjini Swaminathan, Paulo Ceppi, Robin S. Smith, S. T. Rumbold

The editor's rubric

Heuristic review

Leverage3 / 5: A method or resource many groups across the field will adopt within a year.; 16% of this desk’s rubric
Magnitude2 / 5: Solid incremental gain on a meaningful problem.; 20% of this desk’s rubric
Evidence3 / 5: Solid: multiple benchmarks or cohorts, ablations, fair baselines, released code or data.; 20% of this desk’s rubric
Novelty3 / 5: A genuinely new approach to an open problem.; 10% of this desk’s rubric
Trajectory2 / 5: Some room to improve with obvious engineering.; 14% of this desk’s rubric
Stakes3 / 5: Meaningful benefit to many people within a few years.; 20% of this desk’s rubric

Dimension	Level	Weight	What that level means
Leverage	███░░3/5	16%	A method or resource many groups across the field will adopt within a year.
Magnitude	██░░░2/5	20%	Solid incremental gain on a meaningful problem.
Evidence	███░░3/5	20%	Solid: multiple benchmarks or cohorts, ablations, fair baselines, released code or data.
Novelty	███░░3/5	10%	A genuinely new approach to an open problem.
Trajectory	██░░░2/5	14%	Some room to improve with obvious engineering.
Stakes	███░░3/5	20%	Meaningful benefit to many people within a few years.

Editor’s rationale

Heuristic triage from title and abstract text only, not a reading of the paper. Cues found: method (we report); novelty (open problem, discovery); stakes (global scale, climate).

How the score was computed

rank-2026-10-18

Score████░░░░░░4.4

Score = 10 × (75% × adjusted merit / 10 + 15% × attention + 10% × freshness)

Desks place stronger verdicts first, then use this score to order work within the same verdict.

Merit: 5.3 / 10; Weighted rubric, evidence-gated.
Adjusted merit: 4.5 / 10; Shrunk toward the desk prior by editor confidence (40%).
Attention: 10%; Citations, upvotes, points, mentions.
Freshness: 85%; Half-life decay since publication.

Citations2 (reference 15, via openalex, Nov 5, 2026, 07:31 UTC)

The record

Reviewed by heuristic-v10 on Nov 5, 2026, 07:29 UTC. Paper type: method.
Categories: Climate variability and models, Climate Change Policy and Economics, Climate Change and Environmental Impact, Global and Planetary Change, Environmental Science
TOP, No.1 in the Climate & Energy edition of November 5, 2026.