Exceeding 1.5 °C requires rethinking accountability in climate policy

Ganti, G., Fuss, S., Rogelj, J. ORCID: https://orcid.org/0000-0003-2056-9061, Pelz, S. ORCID: https://orcid.org/0000-0002-3528-8679, Riahi, K. ORCID: https://orcid.org/0000-0001-7193-3498, & Schleussner, C.-F. ORCID: https://orcid.org/0000-0001-8471-848X (2026). Exceeding 1.5 °C requires rethinking accountability in climate policy. Nature 649 (8099) 1107-1109. 10.1038/d41586-026-00247-y.

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Abstract

A scientific foundation is required to establish nations’ responsibilities in a hotter ‘overshoot’ world. Around ten years after the Paris climate agreement was adopted, the world is again at a crucial moment. In 2015, 195 countries committed to hold global warming “well below 2 °C” and to “pursue efforts to limit warming to 1.5 °C” to prevent dangerous human interference with the climate system. How to interpret these two temperature levels was ambiguous, but it was clear that both had not yet been reached and were being pursued from below. At the time, pathways to stay below both levels could be modelled3, but much has changed since then.

Item Type:	Article
Research Programs:	Energy, Climate, and Environment (ECE) Energy, Climate, and Environment (ECE) > Integrated Assessment and Climate Change (IACC) Energy, Climate, and Environment (ECE) > Integrated Climate Impacts (ICI) Energy, Climate, and Environment (ECE) > Transformative Institutional and Social Solutions (TISS)
Depositing User:	Michaela Rossini
Date Deposited:	02 Feb 2026 11:20
Last Modified:	02 Feb 2026 11:20
URI:	https://pure.iiasa.ac.at/21274

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