What Does the International Court of Justice Advisory Opinion on Climate Change Mean for Multilateral Environmental Agreements?

The ICJ Advisory Opinion establishes that states must implement multilateral environmental agreements (MEAs) in a coherent, integrated manner, meaning that climate-related duties must inform the implementation of treaties like the Convention on Biological Diversity and the UN Convention to Combat Desertification. Consequently, evidence of systemic and mutually reinforcing actions across different MEAs will now be used to assess a state's due diligence and compliance with international law, increasing the legal and reputational risks of poorly coordinated policy implementation.

• The ICJ Advisory Opinion transforms the integrated implementation of climate-related provisions across different multilateral environmental agreements (MEAs) from a discretionary activity into a metric for assessing a state's due diligence and compliance with international law.
• States are required to integrate climate-related impacts, drivers, and duties into the implementation of other MEAs, such as the UN Convention to Combat Desertification and the Convention on Biological Diversity. Conversely, a state's compliance with the international climate regime is evaluated based on its efforts to protect human rights, oceans, land, and biodiversity.
• The briefing recommends that states align their domestic actions with human rights law, other MEAs, and the international climate regime, while continuously assessing domestic capabilities to ensure that differentiated responsibilities reflect the highest possible ambition.

APA

Kosolapova,, E. (2026). What Does the International Court of Justice Advisory Opinion on Climate Change Mean for Multilateral Environmental Agreements? International Institute for Sustainable Development. https://www.iisd.org/publications/brief/icj-advisory-opinion-multilateral-environmental-agreements

Chicago

Kosolapova,, Elena. What Does the International Court of Justice Advisory Opinion on Climate Change Mean for Multilateral Environmental Agreements? International Institute for Sustainable Development, 2026. https://www.iisd.org/publications/brief/icj-advisory-opinion-multilateral-environmental-agreements.

Wikipedia

{{cite report |last1=Kosolapova, |first1=Elena |title=What Does the International Court of Justice Advisory Opinion on Climate Change Mean for Multilateral Environmental Agreements? |publisher=International Institute for Sustainable Development |date=17 March 2026 |url=https://www.iisd.org/publications/brief/icj-advisory-opinion-multilateral-environmental-agreements |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{kosolapova2026what, author = {Kosolapova,, Elena}, title = {{What Does the International Court of Justice Advisory Opinion on Climate Change Mean for Multilateral Environmental Agreements?}}, institution = {International Institute for Sustainable Development}, year = {2026}, month = mar, url = {https://www.iisd.org/publications/brief/icj-advisory-opinion-multilateral-environmental-agreements}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }