“We saw extraordinary land, sea surface temperatures, extraordinary ocean heat accompanied by very extreme weather affecting many countries around the world, destroying lives, livelihoods, hopes and dreams,” WMO spokesperson Clare Nullis said. “We saw many climate change impacts retreating sea ice glaciers. It was an extraordinary year.”
A bank building burns in Los Angeles, California.
UN Secretary-General António Guterres described the WMO’s findings as further proof of global warming and urged all governments to deliver new national climate action plans this year to limit long-term global temperature rise to 1.5C – and support the most vulnerable deal with devastating climate impacts.
“Individual years pushing past the 1.5℃ limit do not mean the long-term goal is shot,” Mr. Guterres said. “It means we need to fight even harder to get on track. Blazing temperatures in 2024 require trail-blazing climate action in 2025,” he said. “There’s still time to avoid the worst of climate catastrophe. But leaders must act – now.”
The datasets used by WMO are from the European Center for Medium Range Weather Forecasts (ECMWF), the Japan Meteorological Agency, NASA, the US National Oceanic and Atmospheric Administration (NOAA), the UK Met Office in collaboration with the Climatic Research Unit at the University of East Anglia (HadCRUT) and Berkeley Earth.
Listen back to an interview climate scientist Alvaro Silva at the WMO, following the heat alert in the United States at the end of June:
Ocean warming
Highlighting a separate scientific study on ocean warming, WMO said that it had played a key role in last year’s record high temperatures.
“The ocean is the warmest it has ever been as recorded by humans, not only at the surface but also for the upper 2,000 metres,” the UN agency said, citing the findings of the international study spanning seven countries and published in the journal Advances in Atmospheric Sciences.
WMO noted that about 90 per cent of the excess heat from global warming is stored in the ocean, “making ocean heat content a critical indicator of climate change”.
To put the study’s findings into perspective, it explained that from 2023 to 2024, the upper 2,000 metres of ocean became warmer by 16 zettajoules (1,021 Joules), which is about 140 times the world’s total electricity output.