(CNN)The prolonged heatwave in Siberia from January to June, which pushed overall temperatures 5 degrees Celsius (9 degrees Fahrenheit) higher than normal, would have been "almost impossible" if not for human-caused climate change, a new study has found.
Siberian heatwave made 600 times more likely by climate change, experts find
Temperatures in Siberia have been above average since the beginning of the year, with the Russian town of Verkhoyansk recording a temperature of 38 degrees C (100.4 degrees Fahrenheit) in June -- a record temperature for the Arctic.
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.
The heat in Siberia has also accelerated the melting of permafrost. An oil tank built on the frozen soil collapsed in May, leading to one of the worst oil spills ever in the region.
In a rapid attribution study released Wednesday, a team of international researchers found that the prolonged heat like the Arctic region experienced this year would only happen less than once in every 80,000 years without human-induced climate change.
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.