Increasing health risks due to intensified heatwaves, WMO
As global temperatures reach unprecedented levels, the UN World Meteorological Organization (WMO) on Tuesday warned of an increased risk of death as intense heatwaves continued to grip parts of Europe, Asia, North Africa and the United States.
“Heatwaves are amongst the deadliest natural hazards, with hundreds of thousands of preventable deaths each year. It's a rather poorly understood hazard,” said John Nairn, WMO’s Senior Extreme Heat Advisor. “Heat is a rapidly growing health risk due to increased or rapid urbanization, the increasing extreme temperatures and an ageing population.”
According to WMO, this year’s extensive and intense heatwaves are alarming - but not unexpected - as they are in line with forecasts. Scorching conditions “are not your normal weather systems of the past” and are with us “as a consequence of climate change”, Mr. Nairn insisted. “You are losing the North Pole ice and that is reinforcing that mechanism. It will continue and it will continue for some time.”
Temperatures in North America, Asia and across North Africa and the Mediterranean will be above 40° C for a prolonged number of days.
Phoenix in Arizona has suffered temperatures of 46,7 °C during the day and overnight temperatures of 32.2° C. The italian island of Sardinia is expected to see a high of 46 °C this afternoon and Spain has faced consecutive heat waves with temperatures yesterday reaching 44°C.
Highlighting how serious the impacts of heatwaves are on people, economies, the natural built environment, WMO’s Mr. Nairn noted that last summer’s European heatwaves claimed an additional 60,000 lives “That number is considered to be quite conservative,” he said, adding that the European toll happened data comes despite the fact that the continent has some of the strongest early warning systems and heat-health action plans in the world.
“We are seeing continuing growth in the frequency, duration and intensity of heatwaves. And this is entirely consistent with the science of global warming and (Intergovernmental Panel on Climate Change) IPCC reports. These events will continue to grow in intensity, and the world needs to prepare for more intense heatwaves,” said Mr. Nairn.
The WMO expert added that “the recently declared El Niño is only expected to amplify the occurrence and intensity of extreme heat events. So, we're in for a bit of a ride, I'm afraid. And they will have quite serious impacts on human health and livelihoods.”
Replying to a journalist’s question on how the current heatwave had developed, Mr. Nairn pointed to “parked weather systems that accumulate a lot of sunshine and heat in one location that moves extremely slowly…You have to reverse it. You have to do climate repair to change it. So, it is global warming and is going to continue for some time.”
Overnight temperatures are expected to reach new highs in future, according to WMO, which is particularly concerning because repeated high night-time temperatures provide no respite to vulnerable people who face an increased risk of heart attacks and death.
Describing the heatwave as an “invisible emergency”, Panu Saaristo, Emergency Health Unit Team leader from the international Federation of the Red Cross and Red Crescent Societies (IFRC), said that it was crucial to look out for people who were vulnerable because of poor health, but also their socio-economic conditions and living arrangements, “which can also induce risks”.
Low-income neighbourhoods in European cities currently bear the brunt of this invisible emergency, the ICRC official added, noting that heatwaves “also impact other areas of society through reduced economic output, strained health systems and even power outages”.
WMO stressed that worldwide, more intense and extreme heat is unavoidable and that it is imperative to prepare and adapt as cities, homes, workplaces are not built to withstand prolonged high temperatures. Vulnerable people are not sufficient aware of the serious health risk that heat poses to their health and well-being.
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New data showing that rivers were at their lowest level for decades last year provides further evidence that the climate crisis is real and countries must act immediately to protect themselves from the increasing threat to communities and livelihoods, the UN World Meteorological Organization (WMO) said on Thursday.
The key findings from WMO’s State of Global Water Resources 2025 report covering the hydrological cycle and extreme events in the five-year period to last year:
Highlighting the long-term decline in the Earth’s freshwater storage and glacier melt, WMO Secretary-General Celeste Saulo explained that the planet’s water reserves used to act as a planetary “savings account” that absorbed the occasional dry season, avoiding a water crisis. “One of the central stories of the 2025 report is what is happening to that savings account? And the simple answer is that we are depleting it,” she told journalists in Geneva.
Groundwater reserves are equally stretched and have been in decline since 2014, WMO’s report states, with nearly two-thirds of monitored wells worldwide showing levels lower than the historical norm and indicating a shift “further toward deficit…not recovery”.
“At the same time, we are seeing more water-related disasters,” Ms. Saulo said, while also stressing that the currently strengthening El Niño “will increase the risk of drought in some areas, and flooding in others”.
Glaciers disappearing
In 2025, for the fourth consecutive year, every major glaciated region on Earth lost ice mass, leading to short-term hazards including floods and long-term water insecurity, according to WMO.
Responding to a question about whether the changing global water cycle might have contributed to the deadly Nepal-China flooding disaster, Ms. Saulo explained that melting ice and rock was just one factor in the chain of events that ultimately sent a massive and deadly wall of water and debris downstream on 26 August, killing at least 1,367 people.
“You asked if it could happen again? Absolutely; the problem in this region is that there’s 63,700 glaciers at the last count,” she told a Press Conference in Geneva. “Even if you’re looking with remote sensing with satellites at these glaciers, you might see some faults, you might see some slight shifting, that does not mean necessarily catastrophic collapse. So, in order to plan for this, it’s very, very difficult. But the international community is looking very hard at ways in which we can bring people together to solve some of these monitoring issues.”
Data indicates that glaciers shrank between 2023 and 2025 with cumulative losses of 1,400 gigatonnes of water – or about one third of annual fresh water needs.
Every major glacier region on Earth lost ice for the fourth consecutive year.
“All 19 glacier regions around the globe lost ice; in Central Asia, Iceland, the Russian Arctic and western Canada and the United States, it was among the three worst years on record,” said Wayne Jenkinson, WMO’s Director of Hydrology and Cryosphere.
Some regions with smaller glaciers such as Central Europe, the Caucasus, the western Canada and the United States may already have reached “peak water”, Mr. Jenkinson warned.
“After this point, the glacier gives less meltwater each year simply because there is less ice left to melt. That matters for every community downstream that relies on water during hot, dry summers,” he explained.
Narelle van der Wel, WMO’s Head of Cryosphere Monitoring, Predictions and Services, stressed that while some further glacier loss is unavoidable, the eventual scale of the decline is not predetermined.
“Some glacier loss is inevitable, but total loss of glaciers is not yet inevitable,” she said, pointing to emissions reductions as central to limiting future losses.
Preparing for moving baselines
The report does not attribute every observed change to climate change alone. WMO says pressure on water resources and natural variability also contribute.
Mr. Jenkinson said governments need to prepare for “moving baselines” as historical patterns become less reliable.
“The situation 30 years ago is not where we are today,” he said. Countries, he added, need to prepare “for those changes that have really already arrived”.
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