The applicants were elderly Swiss women, members of an association called KlimaSeniorinnen — Senior Women for Climate Protection. Their argument was precise: as older women with cardiovascular conditions, they were disproportionately vulnerable to heat stress from extreme temperature events, those events were made more frequent and severe by climate change, and Switzerland's failure to implement climate policies aligned with its Paris Agreement commitments was therefore a violation of their right to life and private life under Articles 2 and 8 of the European Convention.
The Grand Chamber accepted the argument in full, in a judgment that breaks new ground on three issues: standing, causation, and remedy. On standing, the court held that associations can bring climate human rights claims on behalf of members who share a common vulnerability, without requiring each member to prove individual harm. On causation, the court accepted that a state's failure to implement adequate climate policy is causally linked to increased climate harm risk, applying a population-level attribution methodology. On remedy, the court ordered Switzerland to adopt a binding legislative framework for net-zero emissions with specific intermediate targets reviewable by the court.
The judgment is binding on Switzerland and creates interpretive obligations for all 46 Council of Europe member states. Twelve governments have already received formal communications from the Court's Committee of Ministers requesting information on their climate legislative frameworks in light of the ruling's implications.
The United Kingdom, which remains a Convention signatory post-Brexit, is among the twelve. Its Climate Change Act framework is under legal analysis to assess compliance with the standard the Grand Chamber has now established.
"We did not ask for the impossible," said KlimaSeniorinnen president Rosmarie Wydler-Walti. "We asked for what was promised. The court agreed that a promise to the climate is a promise to human beings."