The UN agency's annual State of the Global Climate report confirmed it wasn't just the hottest year on record, ocean heat reached its highest level since records began, global mean sea level also reached a record high and Antarctic sea ice reached a record low.
The impacts of extreme weather and climate events up-ended life for millions of people across the world and inflicted billions of dollars in economic losses, according to the WMO.
"Extreme climate conditions exacerbated humanitarian crises, with millions experiencing acute food insecurity and hundreds of thousands displaced from their homes," WMO Secretary General Professor Celeste Saulo said.
"Heatwaves, floods, droughts, wildfires and intense tropical cyclones wreaked havoc on every continent and caused huge socio-economic losses."
The report found on an average day in 2023, nearly one third of the global ocean was gripped by a marine heatwave, harming vital ecosystems and food systems.
Concentrations of the three main greenhouse gases, carbon dioxide, methane and nitrous oxide all reached record high observed levels.
Despite the dire state of the climate, the WMO said there was a glimmer of hope, with the rapid expansion of renewable energy generation leading efforts to decarbonise.
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