These are minimal adaptations and they can, hopefully, save a life.
Before spring had ended, a heat dome settled over western Europe and began its quiet, uncounted killing — a pattern now so familiar that researchers can model the deaths before the peak has passed. Heat claims more European lives each year than crime or terrorism, yet fewer than half of the continent's nations have formal plans to address it. The gap between what science knows and what governments do has become, itself, a public health emergency — one that widens with every degree of warming and every summer that arrives ahead of schedule.
- A May heat dome shattered records across the UK and Ireland before most climate shelters had even opened for the season, exposing a dangerous mismatch between when heat strikes and when institutions are prepared to respond.
- Early modeling already places the British death toll at 250 for a single weekend — and the full European count, across a continent where tens of thousands die from heat each year, remains uncounted and largely unpoliticized.
- Only 21 of 38 European countries have formal heat-health action plans, leaving millions — particularly in northern nations whose buildings and bodies are least adapted — without a coordinated safety net.
- Barcelona's network of 400+ climate shelters shows that low-cost, high-impact solutions exist, yet uneven implementation means a friend can arrive at a shelter during 30-degree heat and find the doors locked and the hours cut.
- The most overlooked intervention may be the most human one: checking on elderly neighbors, because older people living alone are vastly overrepresented in heat mortality, and a phone call can alert help before it is too late.
Summer came early this year, and it came with a warning. A heat dome swept western Europe before spring had finished, shattering records in the UK and Ireland. An environmental epidemiologist had already modeled 250 extra deaths in Britain alone during the weekend before the peak. The full European toll remains uncounted — but the pattern is not new. Heat kills more people on this continent than crime or terrorism, and yet most governments were still not ready.
The numbers are unsparing. Only 21 of 38 European countries have formal heat-health action plans. Two-thirds of urban heat deaths are now attributable to climate change. Tens of thousands die each year. And still, in many places, the response is fragmented, underfunded, or absent. Even modest interventions — converting parking lots into green spaces — are treated as radical in some quarters.
Barcelona offers a different story. In 2020, the city began unlocking public buildings — schools, museums, libraries — as climate shelters during extreme heat. The investment was minimal: adjusted opening hours, extra staff, better signage. The program now operates more than 400 shelters and has spread across Spain and into Paris and Vienna. But the system has real limits. Daytime shelters offer little against tropical nights, when temperatures barely fall and exhausted bodies cannot recover. And this year's heat arrived in May, while many shelters weren't scheduled to open until June. A researcher recounted how a friend arrived at a Bilbao shelter during 30-degree heat to find it closed — its hours had actually been reduced.
The deeper challenge may lie in the north. A 2023 study found that countries like the UK, Switzerland, and Norway face the greatest relative increase in uncomfortable temperatures, yet their housing stock and infrastructure were never designed for heat. Britain's climate advisers have called for air conditioning in all care homes and hospitals within a decade, and all schools within 25 years.
Heat, unlike many environmental threats, is something individuals can partially resist — drawing blinds, drinking water, staying indoors at peak hours. But the intervention most often overlooked is the simplest: checking on a neighbor. Older people living alone are vastly overrepresented in heat mortality statistics. A phone call, a cold drink, the willingness to notice an absence — these can alert authorities before tragedy strikes. It is not a substitute for greening cities or cutting emissions. But as another dangerous summer approaches, it may be the difference that matters most.
Summer arrived early this year, and it came with a warning. Before spring had properly finished, a heat dome swept across western Europe, shattering temperature records in the UK and Ireland. By the time the worst of it passed, one environmental epidemiologist had already modeled the damage: 250 extra deaths in Britain alone during the weekend before the peak. The full European toll remains uncounted, but the pattern is clear. Heat kills more people on this continent than crime, terrorism, or almost any other threat we spend time worrying about. Yet as meteorologists announced the imminent return of El Niño conditions and another brutal summer ahead, most European governments were still not ready.
The numbers tell a stark story. A 2024 survey found that only 21 of 38 European countries had formal heat-health action plans. Two-thirds of heat deaths in European cities are now attributable to climate change, according to research from September. Tens of thousands die each year. And yet, in many places, the response remains fragmented, underfunded, or simply absent. The political will to treat heat as the public health emergency it has become has not materialized at the national level. Even modest interventions—converting parking lots into green spaces, for instance—are still treated as radical ideas in some quarters.
There are exceptions. Barcelona offers a model worth studying. In 2020, the city began opening public buildings as climate shelters during extreme heat events. The concept was simple: unlock schools, museums, libraries, and other air-conditioned spaces so people could escape the worst of the temperature and recover. The investment required was minimal. "You need to maybe change the opening hours, put more staff in, train them more, add some signs and communication material," explained Ana Terra Amorim-Maia, a researcher at the Basque Centre for Climate Change. "But these are minimal adaptations and they can, hopefully, save a life." The program worked. Barcelona now operates more than 400 climate shelters, and the model has spread across Spain and into cities from Paris to Vienna.
But the system is not without flaws. Daytime shelters offer little protection against tropical nights—the increasingly common phenomenon where temperatures barely drop after dark, leaving exhausted bodies unable to recover. Timing matters too. This year's heat arrived in May, yet many climate shelters were not scheduled to open until June. Implementation has been uneven. Amorim-Maia recounted how a friend visited a climate shelter in Bilbao during 30-degree heat only to find it closed; its opening hours had actually been reduced over the summer months.
The real challenge ahead may lie not in southern Europe, where buildings and streets have been designed with heat in mind for centuries—shutters, awnings, shaded passages, public fountains—but in the north. A 2023 study found that northern European countries like the UK, Switzerland, and Norway will experience the greatest relative increase in uncomfortable temperatures. Britain's housing stock, poorly insulated for both winter and summer, leaves millions vulnerable. The government's official climate advisers recently recommended installing air conditioning in all care homes and hospitals within a decade, and in all schools within 25 years. Some have called for faster action.
Unlike air pollution or other environmental hazards, heat is a killer we can actually control. Drawing blinds, drinking water, staying indoors during peak hours—these are within reach of individuals. But one piece of advice often gets overlooked: checking on neighbors. Older people living alone appear vastly over-represented in heat mortality statistics. A simple phone call, an introduction with a cold drink, the willingness to notice when someone hasn't been seen—these interventions can alert authorities before tragedy strikes. It is not a substitute for the larger work of greening cities and cutting emissions. But doctors and scientists confirm it can make a meaningful difference. As another summer of dangerous heat approaches, that difference might be the one that matters most.
Notable Quotes
You need to maybe change the opening hours, put more staff in, train them more, add some signs and communication material. But these are minimal adaptations and they can, hopefully, save a life.— Ana Terra Amorim-Maia, researcher at the Basque Centre for Climate Change
The Hearth Conversation Another angle on the story
Why do you think governments have been so slow to act on heat, when the death toll is so clear?
Heat deaths are often invisible in a way that other disasters aren't. They happen quietly, in homes, mostly among people already vulnerable. There's no dramatic moment, no rubble. It's easier to ignore than a flood or a fire.
But the numbers are there. Two-thirds of heat deaths in European cities are linked to climate change. That's not ambiguous.
No, it isn't. But heat-health action plans require sustained funding, coordination between agencies, changes to how cities are designed. It's not a one-time fix. And politically, it doesn't generate the same urgency as a crisis you can point to on the news.
Barcelona seems to have figured it out. What made the difference there?
They realized that the infrastructure already existed—schools, libraries, museums with air conditioning. They just had to unlock the doors and staff them. It was cheap. That clarity helped. Once people saw it could work, it spread.
What about the people who need it most? Are they actually using these shelters?
That's the harder question. A shelter that's closed when someone needs it, or that people don't know about, doesn't save lives. And tropical nights—when it never cools down—those shelters can't solve. You need systemic change alongside the quick fixes.
So what does that look like?
Better insulation in homes. Real investment in cooling infrastructure in the north, where people have no experience with heat. And honestly, the unglamorous work of neighbors checking on neighbors. That might matter more than any policy.