The WMO report follows on the latest UN climate assessment, which warned that humanity must drastically cut its greenhouse gas emissions or face increasingly catastrophic changes to the world’s climate.
The levels of climate-warming carbon dioxide and methane in the atmosphere in 2021 surpassed previous records, the WMO said.
Guterres said that the war in Ukraine was a wake-up call for the world to ditch fossil fuels.
Speaking at the launch of the WMO report, he described the findings as “a dismal litany of humanity’s failure to tackle climate disruption.”
“The global energy system is broken and bringing us ever closer to climate catastrophe. Fossil fuels are a dead end — environmentally and economically,” he will say, according to prepared remarks.
“The war in Ukraine and its immediate effects on energy prices is yet another wake-up call. The only sustainable future is a renewable one. We must end fossil fuel pollution and accelerate the renewable energy transition, before we incinerate our only home,” he said, adding “time is running out.”
Guterres also proposed a five-point plan to speed up the transition to renewables, including making renewable energy technologies, such as battery storage, “essential and freely-available” to the world, as well as shifting subsidies away from fossil fuels “to protect the poor and most vulnerable people and communities.”
He also called for private and public investments in renewable energy to triple to at least $4 trillion dollars a year.
Globally, the average temperature last year was 1.11 degrees Celsius above the pre-industrial average — as the world inches closer to the 1.5C threshold beyond which the effects of warming are expected to become drastic.
Last year’s temperatures were tempered slightly compared to 2020 because of the cooling effects of La Nina in the Pacific, though the year was still among the top seven hottest years on record.
“Our climate is changing before our eyes. The heat trapped by human-induced greenhouse gases will warm the planet for many generations to come,” said WMO Secretary General Petteri Taalas in a statement.
“It is just a matter of time before we see another warmest year on record,” Taalas said.
Oceans bear much of the brunt of the warming and emissions. The bodies of water absorb around 90% of the Earth’s accumulated heat and 23% of the carbon dioxide emissions from human activity.
The ocean has warmed markedly faster in the last 20 years, hitting a new high in 2021, and is expected to become even warmer, the report said. That change would likely take centuries or millennia to reverse, it noted.
The ocean is also now its most acidic in at least 26,000 years as it absorbs and reacts with more carbon dioxide in the atmosphere.
Sea level has risen 4.5 centimeters (1.8 inches) in the last decade, with the annual increase from 2013 to 2021 more than double what it was from 1993 to 2002.
The WMO also listed individual extreme heatwaves, wildfires, floods and other climate linked disasters around the world, noting reports of more than $100 billion in damages.
The continental United States saw its hottest-ever summer, with hundreds of heat-related deaths recorded. The Dixie fire burned 3,900 square kilometers (1,500 square miles), making it California’s largest ever wildfire.