Climate change bolstered Canada fires
Scientists: Likelihood of weather conditions that led to wildfires doubled
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Human-caused climate change doubled the likelihood of the tinderbox weather conditions that sparked Canada's massive summer wildfires and in turn angered U.S. President Donald Trump, according to a study released Thursday.
And fire and climate scientists said Trump, who has talked about punishing Canada for poor fire management and sending days of choking smoke across the border, should look more in the mirror than up north when it comes to blame. They point to the United States' huge historical emissions of heat-trapping gases from the burning of coal, oil and gas.
The fire weather conditions in the Northwest Territories and northwestern Ontario, while unusual but not that rare, were still made twice as likely by global warming, said Thursday's study by World Weather Attribution, a group of international scientists who examine extreme weather conditions to see if there are climate change fingerprints. It's about the same as the team found for summer fires in France, but not nearly as clear a climate fingerprint as they calculated in Spanish fires, which the scientists said were 20 times more likely because of climate change.
The study, which was done so quickly it has not been peer reviewed yet, looked at the weather conditions that are connected to large wildfires and the Canadian index for those conditions, which are heat, lack of rain, humidity and wind. The researchers found the doubling of frequency when -- using scientifically accepted techniques to search for climate fingerprints -- they compared current conditions to a world without the 2.5 degrees of warming that's occurred since the industrial age and burning of fossil fuels started. The weeklong weather conditions that led to the fires in Ontario are now the type that can happen every six years or so, the report said.
"In a pre-industrial climate this would have been much less likely to occur, maybe once in a lifespan. So climate change has made those events more likely," said study co-author Jonathan Boucher, a fire scientist at Canada's Forest Service.
Outside climate and fire scientists said the flash study made sense and reflects a world where hotter and drier conditions are making fires burn more often and more intensely.