The United Nations' top court has declared that failing to curb emissions violates international law, marking a historic moment for global climate justice and setting the stage for future legal action against polluting states.

In a landmark advisory opinion, the International Court of Justice (ICJ) ruled on Wednesday that countries must act collectively and ambitiously to address the 'urgent and existential threat' of climate change.

The court stated that under international law, the human right to a clean, healthy, and sustainable environment is essential for the enjoyment of other human rights.

“Greenhouse gas emissions are unequivocally caused by human activities which are not territorially limited,” said Judge Yuji Iwasawa as he read the court’s opinion in The Hague.

He emphasized that nations are obligated to cooperate and implement “concrete emission reduction targets,” in line with the Paris Agreement’s goal of limiting global warming to below 1.5°C.

Though the opinion is non-binding, legal experts see it as a powerful tool for future environmental litigation. Danilo Garrido of Greenpeace called it “the start of a new era of climate accountability at a global level.”

The case, initiated by the UN General Assembly after lobbying from Vanuatu and backed by over 130 nations, asked the ICJ to clarify states’ legal duties on emissions and consequences for climate inaction.

While small island and developing nations called for binding rules and financial support, wealthier states pointed to existing, largely non-binding agreements like the Paris Accord.

With nearly 3,000 climate lawsuits worldwide and global warming on track to exceed 3°C by 2100, campaigners say the ruling reinforces legal grounds for holding countries and corporations accountable.

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