The World Meteorological Organization (WMO) has issued a stark warning: 2023 was the hottest year ever recorded, confirming the accelerating pace of global warming and its far-reaching consequences. Record-breaking temperatures, melting glaciers, overheating oceans, and increasingly frequent climate disasters paint a troubling picture. The WMO’s latest State of the Global Climate report calls for urgent action to prevent an even more dangerous future.

The World Meteorological Organization (WMO) has once again sounded the alarm. Its State of the Global Climate 2023 report, released on March 19, confirms that 2023 was the warmest year since systematic observations began 174 years ago.

The global average surface temperature was 1.45°C above the pre-industrial average (1850–1900).

“We have never been so close, albeit temporarily for now, to the lower limit of 1.5°C established by the Paris Agreement on climate change,” said Celeste Saulo, Secretary-General of the WMO.

Melting Ice and Overheating Oceans

The report shows that records were broken and in some cases shattered for greenhouse gas concentrations, global surface temperatures, ocean heat content, ocean acidification, sea level rise, Antarctic sea ice extent, and glacier retreat.

According to the WMO, global warming is expected to continue, with many of its impacts becoming irreversible over hundreds to thousands of years.

Global mean sea level rose more than twice as fast between 2014 and 2023 as it did during the period 1993–2002.

In February 2023, Antarctic sea ice reached its lowest extent since satellite observations began in 1979, shrinking by one million square kilometers below the previous record an area roughly equivalent to the combined size of France and Germany.

Glacier loss also reached unprecedented levels. In Switzerland, glaciers lost 10% of their remaining volume in just the past two years, highlighting the accelerating pace of ice melt worldwide.

Climate Disasters on the Rise

Heatwaves, floods, droughts, wildfires, and tropical cyclones are becoming increasingly frequent and severe, undermining economic development and threatening lives around the world.

Between 2019 and 2023, the number of people experiencing food insecurity across the 78 countries monitored by the World Food Programme (WFP) more than doubled, rising from 149 million to 333 million people.

The report highlights several devastating events from 2023:

• Cyclone Mocha, which struck in May, became one of the most intense tropical cyclones ever observed in the Bay of Bengal, forcing 1.7 million people to evacuate.
• Hurricane Otis underwent explosive intensification before making landfall in Acapulco, Mexico, on October 24, killing at least 47 people.
• In Canada, wildfires burned 14.9 million hectares of land: more than seven times the long-term average.
• The deadliest wildfire occurred in Hawaii, where at least 100 people lost their lives and damages were estimated at US$5.6 billion.

A Ray of Hope: Renewable Energy

The report identifies one encouraging trend: the rapid expansion of renewable energy.

According to the WMO, newly installed renewable energy capacity in 2023 increased by nearly 50% compared with 2022, demonstrating that the energy transition is accelerating.

However, the organization stresses that countries must now translate their Nationally Determined Contributions (NDCs) into concrete action at a time when global greenhouse gas emissions continue to rise.

To support this effort, the WMO and the United Nations Development Programme (UNDP) launched a new climate action campaign ahead of the Copenhagen Climate Ministerial, held on March 21–22.

Climate Investment Must Increase Sixfold

Although global climate finance nearly doubled during 2021–2022 compared with 2019–2020, it still represents only 1% of global GDP, according to the Climate Policy Initiative, cited by the WMO.

Current annual climate investments amount to approximately US$1.3 trillion, roughly equivalent to Indonesia’s GDP and about half of France’s GDP.

To keep global warming below 1.5°C, annual investments must increase sixfold, reaching approximately US$9 trillion by 2030—around three times the United Kingdom’s current GDP.

The WMO warns that “the cost of inaction is higher than the cost of climate action.”

If the goals of the Paris Agreement are not met, the cumulative global cost of inaction between 2025 and 2100 could reach US$1,266 trillion, more than twelve times today’s annual global GDP. The organization notes that this estimate is itself likely to be a significant underestimate.

Acting Now to Avoid a More Dangerous Future

The WMO’s latest assessment leaves little room for complacency. The record-breaking temperatures observed in 2023 are not an isolated event but part of a long-term warming trend with profound consequences for ecosystems, economies, and societies worldwide.

Reducing greenhouse gas emissions, accelerating the deployment of renewable energy, and significantly increasing climate finance are no longer optional they are essential if the objectives of the Paris Agreement are to remain within reach.

The future of the planet will be determined by the actions taken today.