Que signifie l’avis consultatif de la Cour internationale de Justice sur le changement climatique pour l’adaptation au climat?

This IISD briefing analyzes a July 2025 ICJ advisory opinion which establishes that climate adaptation is a binding legal obligation for states under international law, rather than a voluntary national choice. It details the procedural and substantive requirements for states, the application of a 'due diligence' standard for compliance, the binding obligation of developed nations to provide adaptation finance to developing countries, and the critical link between adaptation and the protection of fundamental human rights.

• The 2025 ICJ advisory opinion shifts the status of climate adaptation from a voluntary national choice to a binding international legal obligation. The Court determined that international treaties and customary law require states to plan and implement adaptation measures to address predictable climate risks and vulnerabilities.
• Under the UNFCCC and the Paris Agreement, states have specific procedural obligations regarding adaptation. These include the regular formulation and updating of national adaptation plans, conducting vulnerability and impact assessments, integrating climate considerations into socio-economic and environmental policies, and enhancing international cooperation.
• The ICJ established a 'due diligence' standard to evaluate whether states are meeting their adaptation obligations. This standard requires states to use the best available scientific information (such as IPCC data), adopt precautionary and forward-looking policies, and follow an iterative adaptation cycle of assessment, planning, implementation, and monitoring.
• Developed countries have a binding legal obligation to provide financial support, technology transfer, and capacity building to developing nations to enable adaptation. The Court notes that the determination of due diligence must account for the principle of common but differentiated responsibilities and respective capabilities.
• Climate adaptation is linked to international human rights law. The ICJ stated that climate change can severely compromise rights such as the right to life, health, food security, and a healthy environment. States may fail their human rights obligations if they do not implement adequate and timely adaptation measures, particularly for marginalized and disproportionately affected groups.
• Adaptation obligations are not exclusive to climate treaties but are reinforced by other Multilateral Environmental Agreements (MEAs). For example, actions under the Kunming-Montreal Global Biodiversity Framework (Convention on Biological Diversity) and the UN Convention to Combat Desertification contribute to a state's overall compliance with its climate adaptation obligations.

APA

Qi, J. (2026). Que signifie l’avis consultatif de la Cour internationale de Justice sur le changement climatique pour l’adaptation au climat? International Institute for Sustainable Development. https://www.iisd.org/system/files/2026-03/icj-advisory-opinion-climate-adaptation-fr.pdf

Chicago

Qi, Jeffrey. Que signifie l’avis consultatif de la Cour internationale de Justice sur le changement climatique pour l’adaptation au climat? International Institute for Sustainable Development, 2026. https://www.iisd.org/system/files/2026-03/icj-advisory-opinion-climate-adaptation-fr.pdf.

Wikipedia

{{cite report |last1=Qi |first1=Jeffrey |title=Que signifie l’avis consultatif de la Cour internationale de Justice sur le changement climatique pour l’adaptation au climat? |publisher=International Institute for Sustainable Development |date=March 2026 |url=https://www.iisd.org/system/files/2026-03/icj-advisory-opinion-climate-adaptation-fr.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{qi2026que, author = {Qi, Jeffrey}, title = {{Que signifie l’avis consultatif de la Cour internationale de Justice sur le changement climatique pour l’adaptation au climat?}}, institution = {International Institute for Sustainable Development}, year = {2026}, month = mar, url = {https://www.iisd.org/system/files/2026-03/icj-advisory-opinion-climate-adaptation-fr.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }