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This briefing by the International Institute for Sustainable Development explains that the International Court of Justice (ICJ) Advisory Opinion on the Obligations of States in Respect of Climate Change establishes a legal imperative for states to phase out fossil fuel subsidies and other environmentally harmful financial support.

This guide, published by the International Institute for Sustainable Development (IISD) and Porticus, provides a strategic framework for philanthropic organizations to advance the reform of environmentally harmful subsidies (EHS). It argues that redirecting a portion of the USD 2 trillion annually spent on EHS could significantly fund biodiversity and climate goals. The document outlines a theory of change based on defining problems, identifying solutions, and creating political support to open 'policy windows' for reform.

This briefing by the International Institute for Sustainable Development (IISD) analyzes the implications of the July 2025 International Court of Justice (ICJ) Advisory Opinion on the Obligations of States in Respect of Climate Change, specifically regarding environmentally harmful subsidies. It argues that the ICJ's findings transform the phase-out of fossil fuel subsidies from a political commitment into a legal imperative, potentially exposing states to international and domestic litigation.