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World Meteorological Organization

WMO confirms that 2023 smashed global temperature record

Elizabeth BakerBy Elizabeth BakerJanuary 17, 20244 Mins Read
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The World Meteorological Organization (WMO) has officially confirmed that 2023 was the warmest year on record, by a huge margin.

The annual average global temperature approached 1.5°C above pre-industrial levels. The organization highlighted that this is significant because the Paris Agreement on climate change aims to limit the long-term temperature increase (averaged over decades rather than an individual year like 2023) to no more than 1.5°C above pre-industrial levels.

In total, six international data sets used for monitoring global temperatures and consolidated by WMO show that the annual average global temperature was 1.45 ±0.12°C above pre-industrial levels (1850-1900) in 2023. Global temperatures in every month between June and December set new monthly records. July and August were the two hottest months on record.

“Climate change is the biggest challenge that humanity faces. It is affecting all of us, especially the most vulnerable,” said Prof. Celeste Saulo, who became WMO secretary-general on January 1, 2024. “We cannot afford to wait any longer. We are already taking action but we have to do more and we have to do it quickly. We have to make drastic reductions in greenhouse gas emissions and accelerate the transition to renewable energy sources. The shift from cooling La Niña to warming El Niño by the middle of 2023 is clearly reflected in the rise in temperature from last year. Given that El Niño usually has the biggest impact on global temperatures after it peaks, 2024 could be even hotter.”

Prof. Saulo continued, “While El Niño events are naturally occurring and come and go from one year to the next, longer-term climate change is escalating, and this is unequivocally because of human activities. The climate crisis is worsening the inequality crisis. It affects all aspects of sustainable development and undermines efforts to tackle poverty, hunger, ill-health, displacement and environmental degradation.”

Since the 1980s, each decade has been warmer than the previous one. The past nine years have reportedly been the warmest on record. The years 2016 (strong El Niño) and 2020 were previously classed as the warmest on record, at 1.29 ±0.12°C and 1.27 ±0.12°C above the pre-industrial era. Based on the six data sets, the 10-year average 2014-2023 was 1.20 ±0.12°C above the 1850-1900 average, factoring in a margin of uncertainty.

“Humanity’s actions are scorching the earth. 2023 was a mere preview of the catastrophic future that awaits if we don’t act now. We must respond to record-breaking temperature rises with path-breaking action,” said António Guterres, UN secretary-general. “We can still avoid the worst of climate catastrophe. But only if we act now with the ambition required to limit the rise in global temperature to 1.5°C and deliver climate justice.”

According to the WMO, long-term monitoring of global temperatures is just one indicator of climate and how it is changing. Other key indicators include atmospheric greenhouse gas concentrations, ocean heat and acidification, sea level, sea ice extent and glacier mass balance.

WMO’s provisional State of the Global Climate in 2023 report, published on November 30, 2023, showed that records were broken across the board. Sea surface temperatures were exceptionally high for much of the year, accompanied by severe and damaging marine heatwaves. Antarctic sea ice extent was the lowest on record, both for the end-of-summer minimum in February and the end-of-winter maximum in September.

These long-term changes in the Earth’s climate play out through the weather on a day-to-day basis. In 2023, extreme heat affected health and helped fuel devastating wildfires. Intense rainfall, floods and rapidly intensifying tropical cyclones left a trail of destruction, death and huge economic losses.

WMO will issue its final State of the Global Climate 2023 report in March 2024. This will include details on socioeconomic impacts on food security, displacement and health.

For more key World Meteorological Organization (WMO) updates, click here.

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