With summer not officially started, Europe is already experiencing a major heatwave as a result of climate change. According to experts at the World Meteorological Organisation (WMO), heatwaves are starting earlier, becoming more frequent and severe due to record-level concentrations of greenhouse gases in the atmosphere.
Speaking to journalists at a news briefing at the United Nations in Geneva, WMO’s spokesperson Clare Nullis said that “an unusually early and intense heat wave has hit parts of Europe this week." She adding saying that "it spread up from North Africa through Spain, Portugal, it’s hitting France today, and then it will peak Switzerland, Germany over the weekend.”
Although it is only mid-June, temperatures are more typical of those witnessed in July or August.
“Some parts of Spain and France, temperatures are more than 10 degrees higher, that's huge than the average for this time of year,” said Clare Nullis.
The WMO’s spokesperson particularly issued a warning of wildfires in Spain.
“Nearly the entire country of Spain, it's a big red map today, faces an extreme fire risk”, Clare Nullis said. “So, our message to Spanish audiences, please, please, please heed all the warnings. There is extreme fire danger today. So please take care.”
Also France saw its warmest and driest May on record. For today, 12 French departments have a top-level Red Alert.
Studies into recent extreme heat events such as in Indian and Pakistan earlier this year, in Siberia in 2020 or in western Europe in 2019 have all highlighted the role of human-induced climate change.
According to Clare Nullis, “as a result of climate change, heat waves are starting earlier. They're becoming more frequent and more severe because of concentrations of greenhouse gases in the atmosphere which are at record level.”
The Intergovernmental Panel on Climate Change projects that for 1,5 Celsius of global warming, there will be increasing heat waves, longer warm seasons and short cold season. With the rise of global temperature at 2 Celsius heat extremes would more often reach critical tolerance thresholds for agriculture and health.
Extreme heat is deadly, especially for the vulnerable.
“High minimum overnight temperatures when the body needs to recover, this is particularly dangerous”, pointed out Clare Nullis.
She added that city dwellers are particularly susceptible “because of the urban heat island effect, you know cities temperature can be 6 degrees Celsius higher than rural areas.”
WMO’s message is: We have to adapt through early warning systems, and much more can be done to saving lives than it was done in the past such as regreening the cities.
“You see some of the architecture now in cities which are literally greening cities, greening apartments", Clare Nullis said. "So, there's a lot that we can and that we really should be doing.”
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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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