The women live scattered around Switzerland, speak a mix of the country’s languages — German, French and Italian — and have worked in varying professions.

But the Klima Seniorinnen Schweiz, a group of about 2,400 Swiss women aged 64 and over, say they have a common fear: soaring temperatures and heat waves that are threatening them with health ailments in their final decades.

“It is difficult to go outside — it is difficult to breathe,” said Fatima Heussler, 71, a member of the group who lives in Zurich, who retired after several decades of working with visually impaired older people. Last year’s summer heat was so tiring, she said she could not do even light household chores.

“I feel like I need to protect myself,” said Isabelle Joerg, 70, a former insurance risk manager and a member of the group from Basel, who says she sits in the dark with the blinds drawn at her home on particularly hot days. “I used to love summer — and now I can be threatened by it.”

A heat wave this summer that sent temperatures soaring in southern Europe has highlighted those concerns — along with a landmark lawsuit that the women filed in 2020 at Europe’s top human rights court accusing the Swiss government of violating their fundamental rights by not doing enough to protect them from the effects of climate change.

Switzerland experienced its hottest year on record last year, and though it has not been battered as much as southern Europe this year, a hot spell early last month sent temperatures as high as 37 degrees Celsius in some Alpine areas. The national average last month was about 15 degrees Celsius, about 35 degrees higher than pre-1900 records.

The case, the first of its kind to be heard at that top court, the European Court for Human Rights, is among a growing number of lawsuits around the world using human rights grounds to argue that governments are shirking their obligations, as temperatures and sea levels rise, to ensure the safety and security of citizens.

Similar cases have come before national courts and human rights bodies, including a finding by a United Nations human rights committee that Australia had failed to protect Indigenous Australians in the Torres Strait, in the north of the country, from “the adverse impacts of climate change”.

While climate change is affecting all Swiss people, the Klima Seniorinnen Schweiz — known in English as the Senior Women for Climate Protection Switzerland — say that older women like them are the most vulnerable.

One recent study found that last summer’s heat waves killed more than 61,000 people across Europe, most of them women over 80. In Switzerland, more than 60 per cent of about 600 heat-related deaths last summer were attributed to global warming, according to a study from the University of Bern, with older women having the highest mortality rate.

“Our health is at risk,” said Elisabeth Stern, 75, a member of the Klima Seniorinnen in Zurich and an avid hiker, who said she had kept herself fit and healthy her whole life. Last summer, sick of staying indoors with the windows shut, Stern, a former cultural anthropologist, visited the cooler mountains for a reprieve. But she collapsed in a cable car, overcome by the heat.

“There was a time when Switzerland was a cold place in general,” said Stern, who spent part of her childhood on a farm in Switzerland’s east and has watched a nearby glacier disappear in her lifetime. “It just has changed so rapidly.”

Experts say a ruling in the case brought by the Klima Seniorinnen will most likely influence how the 46 countries that are members of the European court will handle similar claims.

“This will have a domino effect,” said Annalisa Savaresi, a senior lecturer for environmental law at the University of Stirling, in Scotland, who has studied climate change litigation. “It’s the first of its kind to be heard, but there are many others in the pipeline.”

The litigants in the Swiss case include four women who said they had heart and respiratory diseases that put them at risk of death on hot days.

The crux of the complaint is a charge that the Swiss government’s failure to reduce greenhouse gas emissions enough to prevent global warming of 2 degrees Celsius is at odds with its obligations under the European Human Rights Convention. Those include rights to life and autonomy, given that older women have been proved to be particularly vulnerable to heat-related illnesses.

“What this would give citizens is an additional tool to name and shame these states and make their grievances visible and, eventually, enforceable,” Savaresi said. But, she added, how such rulings could be imposed remain in “uncharted territory”.

The Swiss government has argued that international law does not give individuals rights to be protected from climate change, and that addressing its effects should be a political, rather than legal, process.

Other governments, like Ireland’s, have also given arguments in the case on behalf of the Swiss government, while several rights groups have supported the litigants.

Marc Willers, one of the lawyers involved, said the litigants felt a moral obligation to pursue the case. If Switzerland, one of the richest and most technologically advanced countries in the world, did not step up to tackle climate change, he said, “what hope is there that other countries will fill the gap?”

New York Times News Service