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The Hague’s Verdict: History Can Be Held Accountable for Climate Harm

Shaheen P Parshad

 

In the marble halls of the Peace Palace, the International Court of Justice delivered a unanimous advisory opinion on 23 July 2025 that will echo through the corridors of power for decades. The Court declared that every state carries a customary duty to prevent “significant harm” to the climate system, and that this responsibility stretches back to the carbon that has been pouring into the atmosphere for generations. In plain language, a nation that has profited from fossil fuels can be sued by another state for the damage caused, even when those emissions occurred before modern climate treaties existed.

 

What makes this opinion a watershed moment is its insistence that the past is not a free pass. By affirming that cumulative emissions—those released decades before the Paris Agreement—can ground a claim for state responsibility, the judges rejected the long‑standing argument that “old” emissions are beyond the reach of law. The Court anchored the 1.5 °C temperature target in the best available science, giving that goal the force of a legally binding norm. Nationally Determined Contributions must now be progressively more ambitious, and any backsliding could be judged against this international standard.

 

The decision also puts the fossil‑fuel industry on notice. Granting new exploration licences, subsidising coal or oil, or failing to regulate private actors can constitute an internationally wrongful act. By linking state conduct to a stringent due diligence standard, the opinion creates a legal risk for governments that continue to prop up carbon‑intensive economies. This shift could reshape investment treaties, making it harder for fossil‑fuel companies to hide behind ISDS clauses that once insulated them from climate‑related claims.

 

Although the advisory opinion is not binding on domestic courts, its moral and political weight is formidable. It offers climate‑vulnerable nations a firmer legal footing to demand reparations and climate finance, while investors in renewable energy can point to the ruling as a shield against policy reversals that favour fossil fuels. In the months ahead, expect the first lawsuits testing the Court’s language on historic emissions and reparations, as well as moves by governments to rewrite licensing regimes and embed the 1.5 °C target into national law.

 

The ICJ has handed the world a powerful new tool—one that turns abstract climate promises into concrete legal obligations. The real work now is turning those obligations into tangible climate action.

 

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