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Global temperatures “smashed” heat records last year, as heatwaves stalked oceans and glaciers suffered record ice loss, the United Nations said Tuesday — warning 2024 was likely to be even hotter.

The annual State of the Climate report by the UN weather and climate agency confirmed preliminary data showing 2023 was by far the hottest year ever recorded.

And last year capped off “the warmest 10-year period on record”, the World Meteorological Organization said, with even hotter temperatures expected.

“There is a high probability that 2024 will again break the record of 2023”, WMO climate monitoring chief Omar Baddour told reporters.

Reacting to the report, UN chief Antonio Guterres said it showed “a planet on the brink”.

“Earth’s issuing a distress call,” he said in a video message, pointing out that “fossil fuel pollution is sending climate chaos off the charts”, and warning that “changes are speeding up”.

The WMO said that last year the average near-surface temperature was 1.45 degrees Celsius above pre-industrial levels — dangerously close to the critical 1.5-degree threshold that countries agreed to avoid passing in the 2015 Paris climate accords.

“I am now sounding the red alert about the state of the climate,” Saulo told reporters, lamenting that “2023 set new records for every single climate indicator”.

The organisation said many of the records were “smashed” and that the numbers “gave ominous new significance to the phrase ‘off the charts’.”

“What we witnessed in 2023, especially with the unprecedented ocean warmth, glacier retreat and Antarctic sea ice loss, is cause for particular concern,” Saulo said.

One especially worrying finding was that marine heatwaves gripped nearly a third of the global ocean on an average day last year.

And by the end of 2023, more than 90 percent of the ocean had experienced heatwave conditions at some point during the year, the WMO said.