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May was world's second-hottest on record, EU scientists say

May was world's second-hottest on record, EU scientists say

The Herald11-06-2025

The world experienced its second-warmest May this year since records began, a month in which climate change fuelled a record-breaking heatwave in Greenland, scientists said on Wednesday.
Last month was Earth's second-warmest May on record, exceeded only by May 2024, rounding out the northern hemisphere's second-hottest March-May spring on record, the EU's Copernicus Climate Change Service (C3S) said in a monthly bulletin.
Global surface temperatures last month averaged 1.4°C higher than in the 1850-1900 pre-industrial period, when humans began burning fossil fuels on an industrial scale, C3S said.
That broke a run of extraordinary heat, in which 21 of the last 22 months had an average global temperature exceeding 1.5°C above pre-industrial times, though scientists warned the break was unlikely to last.
"While this may offer a brief respite for the planet, we do expect the 1.5°C threshold to be exceeded again in the near future due to the continued warming of the climate system," said C3S director Carlo Buontempo.
The main cause of climate change is greenhouse gas emissions from burning fossil fuels. Last year was the planet's hottest on record.
A separate study, published by the World Weather Attribution group of climate scientists on Wednesday, found human-caused climate change made a record-breaking heatwave in Iceland and Greenland last month about 3°C hotter than it otherwise would have been, contributing to a huge additional melting of Greenland's ice sheet.
"Even cold climate countries are experiencing unprecedented temperatures," said Sarah Kew, study co-author and researcher at the Royal Netherlands Meteorological Institute.
The global threshold of 1.5°C is the limit of warming which countries vowed under the Paris climate agreement to try to prevent to avoid the worst consequences of warming.
The world has not yet technically breached the target, which refers to an average global temperature of 1.5°C over decades.
However, some scientists have said it can no longer realistically be met, and have urged governments to cut CO² emissions faster to limit the overshoot and the fuelling of extreme weather.
C3S's records go back to 1940 and are cross-checked with global temperature records going back to 1850.
Reuters

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Greenland ice melted much faster than average in May heatwave
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NUUK - Greenland's ice sheet melted 17 times faster than the past average during a May heatwave that also hit Iceland, the scientific network World Weather Attribution (WWA) said in a report. The Arctic region is on the frontline of global warming, heating up four times faster than the rest of the planet since 1979, according to a 2022 study in scientific journal Nature. Climate change intensified the seven days of heat in May in Iceland by about three degrees Celsius, the WWA said. And in Greenland, "the melting rate of the Greenland ice sheet by, from a preliminary analysis, a factor of 17... means the Greenland ice sheet contribution to sea level rise is higher than it would have otherwise been without this heat wave," one of the authors of the report, Friederike Otto, told reporters. "Without climate change this would have been impossible," said Otto, an associate professor in climate science at the Imperial College London. The data from the May 15-21, 2025 heatwave was compared to the average ice melt for the same week during the period 1980-2010. In Iceland, the temperature exceeded 26 degrees Celsius (79 Fahrenheit) on May 15, unprecedented for that time of year on the subarctic island. "Temperatures over Iceland as observed this May are record-breaking, more than 13 degrees Celsius hotter than the 1991-2020 average May daily maximum temperatures," the WWA said. In May, 94 percent of Iceland's weather stations registered record temperatures, according to the country's meteorological institute. In eastern Greenland, the hottest day during the heatwave was about 3.9C warmer compared to the preindustrial climate, the WWA said. "While a heatwave that is around 20 degrees Celsius might not sound like an extreme event from the experience of most people around the world, it is a really big deal for this part of the world," Otto said. "It affects the whole world massively," she said. More intense heatwaves have hit the two territories in recent decades, but they have occurred later in the summer -- in late July and early August in 2008, and in August 2004.

May 2025 second warmest on record: EU climate monitor
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PARIS - Global heating continued as the new norm, with last month the second warmest May on record on land and in the oceans, according to the European Union's climate monitoring service. The planet's average surface temperature dipped below the threshold of 1.5 degree Celsius above preindustrial levels, just shy of the record for May set last year, according to the Copernicus Climate Change Service. The same held for the world's oceans. With a surface temperature of 20.79C, last month was second only to May 2024, with some unprecedented warmth regionally. "Large areas in the northeast North Atlantic, which experienced a marine heatwave, had record surface temperatures for the month," Copernicus reported. "Most of the Mediterranean Sea was much warmer than average." The increasingly dire state of the oceans is front-and-centre at the third UN Ocean Conference (UNOC), which kicked off Monday in Nice, France. Ocean heatwaves are driving marine species to migrate, damaging ecosystems, and reducing the ability of ocean layers to mix, thus hindering the distribution of nutrients. Covering 70 percent of the globe's surface, oceans redistribute heat and play a crucial role in regulating Earth's climate. Surface water warmed by climate change drive increasingly powerful storms, causing new levels of destruction and flooding in their wake. Some parts of Europe, meanwhile, "experienced their lowest levels of precipitation and soil moisture since at least 1979," Copernicus noted. Britain has been in the grips of its most intense drought in decades, with Denmark and the Netherlands also suffering from a lack of rain. Earth's surface last month was 1.4C above the preindustrial benchmark, defined as the average temperature from 1850 to 1900, before the massive use of fossil fuels caused the climate to dramatically warm. "May 2025 interrupts an unprecedentedly long sequence of months above 1.5C," noted Carlo Buontempo, director of the Copernicus Climate Change Service. All but one of the previous 22 months crossed this critical threshold, which marks the 2015 Paris Agreement's most ambitious target for capping global warming. "This may offer a brief respite for the planet, but we expect the 1.5C threshold to be exceeded again in the near future due to the continued warming of the climate system," he added.

May was world's second-hottest on record, EU scientists say
May was world's second-hottest on record, EU scientists say

The Herald

time11-06-2025

  • The Herald

May was world's second-hottest on record, EU scientists say

The world experienced its second-warmest May this year since records began, a month in which climate change fuelled a record-breaking heatwave in Greenland, scientists said on Wednesday. Last month was Earth's second-warmest May on record, exceeded only by May 2024, rounding out the northern hemisphere's second-hottest March-May spring on record, the EU's Copernicus Climate Change Service (C3S) said in a monthly bulletin. Global surface temperatures last month averaged 1.4°C higher than in the 1850-1900 pre-industrial period, when humans began burning fossil fuels on an industrial scale, C3S said. That broke a run of extraordinary heat, in which 21 of the last 22 months had an average global temperature exceeding 1.5°C above pre-industrial times, though scientists warned the break was unlikely to last. "While this may offer a brief respite for the planet, we do expect the 1.5°C threshold to be exceeded again in the near future due to the continued warming of the climate system," said C3S director Carlo Buontempo. The main cause of climate change is greenhouse gas emissions from burning fossil fuels. Last year was the planet's hottest on record. A separate study, published by the World Weather Attribution group of climate scientists on Wednesday, found human-caused climate change made a record-breaking heatwave in Iceland and Greenland last month about 3°C hotter than it otherwise would have been, contributing to a huge additional melting of Greenland's ice sheet. "Even cold climate countries are experiencing unprecedented temperatures," said Sarah Kew, study co-author and researcher at the Royal Netherlands Meteorological Institute. The global threshold of 1.5°C is the limit of warming which countries vowed under the Paris climate agreement to try to prevent to avoid the worst consequences of warming. The world has not yet technically breached the target, which refers to an average global temperature of 1.5°C over decades. However, some scientists have said it can no longer realistically be met, and have urged governments to cut CO² emissions faster to limit the overshoot and the fuelling of extreme weather. C3S's records go back to 1940 and are cross-checked with global temperature records going back to 1850. Reuters

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