Ottawa, Aug. 6: Human driven climate change significantly increased the likelihood of the extreme weather conditions that fuelled Canada’s massive wildfires this summer, according to a new scientific analysis released on Thursday. Researchers concluded that global warming made the combination of heat, dry conditions and strong winds about twice as likely, intensifying one of the country’s most destructive wildfire seasons.
The report, prepared by the international research group World Weather Attribution, examined the weather patterns linked to major wildfires in Canada’s Northwest Territories and northwestern Ontario. Scientists assessed factors including temperature, rainfall, humidity and wind, finding clear evidence that rising global temperatures played a major role in creating conditions favourable for large-scale fires.
Using established climate attribution methods, the researchers compared today’s climate with a pre-industrial world before widespread fossil fuel use. Their findings suggest that the weather conditions responsible for the Ontario fires, which now occur roughly once every six years, would have been far less frequent without human-induced warming.
Study co-author Jonathan Boucher of the Canadian Forest Service said climate change has substantially increased the probability of such extreme fire weather, making severe wildfire events more common than in previous generations.
Independent climate and wildfire specialists supported the findings, noting that hotter and drier environments are contributing to more frequent and intense fire outbreaks across many regions of the world. They said climate change has amplified natural fire risks, particularly in forests already vulnerable to prolonged dry spells.
Researchers explained that lightning ignited several of the major fires in Canada’s northern regions, but unusually dry vegetation, high temperatures and persistent winds allowed the blazes to spread rapidly beyond the capacity of firefighting teams. Scientists added that while human activity causes many wildfires, lightning-triggered fires account for the overwhelming majority of the total land area burned in Canada each year.
The study also drew attention to the challenges of controlling fires in Canada’s vast northern forests, where remote terrain and limited access often delay emergency response. Experts noted that these natural conditions make wildfire suppression particularly difficult during periods of extreme weather.
The findings come amid criticism from US President Donald Trump, who has argued that Canada’s wildfire crisis stems primarily from poor forest management and has suggested possible punitive measures over smoke drifting into the United States.
Climate scientists rejected that assessment, arguing that historical greenhouse gas emissions have played a far greater role in creating the conditions that intensified the fires. They pointed out that rising global temperatures have increased wildfire risks across North America, with both Canada and the United States experiencing larger areas burned in recent decades.
Researchers concluded that reducing fossil fuel emissions remains essential to limiting the frequency and intensity of future wildfire seasons, warning that continued warming will further increase the risk of destructive fires unless meaningful climate action is taken.