Europe’s top human rights court said Tuesday that the Swiss government had violated its citizens’ rights by not doing enough to stop climate change, a landmark ruling that experts said could bolster activists hoping to use human rights law to hold governments to account.

In the case, which was brought by a group called KlimaSeniorinnen, or Senior Women for Climate Protection, the European Court of Human Rights in Strasbourg, France, said Switzerland had failed to meet its target in reducing carbon emissions and must act to address that shortcoming.

The women, 64 and older, said their health was at risk during heat waves related to global warming. They argued that the Swiss government, by not doing enough to mitigate against global warming, had violated their rights.