This briefing explores the questions raised during the second ESM2025 policy forum.
Our second policy forum was held in November 2023, where insights and advances in climate and Earth system were discussed. This briefing explores the following policy-relevant new findings and the questions raised by the 4C, PROVIDE, CONSTRAIN and ESM2025 projects:
A. The possible reduction in the efficiency of carbon sinks as the climate warms;
B. The need for a revised 1.5°C carbon budget;
C. The risks of climate overshoot;
D. The importance of reducing non-CO2 greenhouse gases.
This briefing is the second of a series of policy briefings that address the questions raised during our exchanges with the stakeholder community.

ESM2025
The project goal of ESM2025 is to advance the understanding of the Earth system and its response to human activities. The project aims to develop the next generation of European Earth System Models including a more comprehensive representation of the Earth's response to anthropogenic emissions and human land-use change. The improved models will help to enhance the consistency of climate and mitigation-relevant processes across Earth System and Integrated Assessment models and provide valuable scientific insights to support successful implementation of the Paris Agreement. Results from coordinated simulations with the new models will also provide more robust guidance on future global environmental risks, supporting policies targeting adaptation to global change.Project details
- Project title: “Earth System Models for the Future” (ESM2025)
- Funding scheme: Horizon 2020 (Grant agreement no. 101003536)
- Duration: 4 years (1 June 2021 – 31 May 2025)
- Project coordinator: Météo France-CNRM, France
- Project website: www.esm2025.eu
- Project key messages: ESM2025 key messages for each target audience
- Presentation video: https://www.youtube.com/watch?v=x3evSTOBE18

