The heat in the vast Russian region triggered widespread wildfires in June, associated with an estimated 56 million tons of carbon dioxide — more than the annual emissions of some industrialized nations like Switzerland and Norway.
This, researchers said, would make such an event “almost impossible” in a climate that had not been warmed by greenhouse gas emissions.
Scientists found that climate change increased the chances of prolonged heat by a factor of at least 600, and warned that greenhouse gases released by the fires and melting permafrost will further heat the planet, and decrease the planet’s reflectivity from loss of snow and ice.
Siberia experienced its warmest June on record — up to 10 degrees Celsius (18 degrees Fahrenheit) higher than average –according to the Copernicus Climate Change Service, a program affiliated with the European Commission.
The region tends to experience large swings in temperature month-to-month and year-to-year. But temperatures in the region have stayed well above average since 2019, which is unusual.
“The findings of this rapid research — that climate change increased the chances of the prolonged heat in Siberia by at least 600 times — are truly staggering,” Andrew Ciavarella, lead author of the research and senior detection and attribution scientist at the Met Office, said in a statement.
“This research is further evidence of the extreme temperatures we can expect to see more frequently around the world in a warming global climate. Importantly, an increasing frequency of these extreme heat events can be moderated by reducing greenhouse gas emissions,” he added.
The scientists said that, even in the current climate, the prolonged heat was still unlikely, with such extreme conditions being expected to occur less than once every 130 years.
However, without rapid cuts in greenhouse gas emissions they risk becoming frequent by the end of the century, experts warned.
This story has been updated to correct a conversion from Celsius to Fahrenheit.
CNN’s Zamira Rahim and Hilary McGann contributed reporting.