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

This briefing discusses the implications of the International Court of Justice (ICJ) Advisory Opinion on the Obligations of States in Respect of Climate Change for Multilateral Environmental Agreements (MEAs), emphasizing that states must now implement climate-related provisions across different treaties in a systemic and integrated manner to ensure compliance with international law.

• The ICJ Advisory Opinion on the Obligations of States in Respect of Climate Change has shifted the integrated implementation of climate-related provisions across Multilateral Environmental Agreements (MEAs) from being largely discretionary to a requirement for assessing due diligence and compliance with international law.
• States are required to integrate climate-related impacts, drivers, and duties when fulfilling obligations under MEAs, including the UN Convention to Combat Desertification and the Convention on Biological Diversity. Conversely, compliance with the international climate regime is evaluated based on a state's efforts regarding human rights and the protection of oceans, land, and biodiversity.
• The briefing recommends that states align domestic actions with human rights law, other MEAs, and the international climate regime, while coordinating climate-related provisions across MEAs through mutually reinforcing and systemic actions. States should also continuously evaluate 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} }