A recent study has linked human-induced climate change to the increased likelihood of weather conditions that fueled this summer’s extensive wildfires in Canada, particularly across the Northwest Territories and northwestern Ontario. The research found that global warming has doubled the chance of experiencing the hot, dry, and windy weather that contributes to large wildfire outbreaks.

The study, conducted by World Weather Attribution, a consortium of international climate scientists, analyzed weather patterns associated with the wildfires and compared them to a hypothetical scenario without the approximately 2.5 degrees Celsius of global warming since the start of the industrial era. Using recognized methodologies to detect climate change signals in extreme weather, the researchers concluded that the weeklong conditions causing the fires now occur about every six years, whereas in a pre-industrial climate, they might have happened only once in a lifetime.

Jonathan Boucher, a fire scientist with Canada’s Forest Service and co-author of the study, emphasized that climate change has significantly increased the probability of such events. Independent experts echoed these findings, highlighting the broader trend of rising temperatures and drier landscapes intensifying fire frequency and severity. Mike Flannigan, a fire scientist at Thompson Rivers University in Canada who was not involved in the research, described the situation as nature experiencing heightened fire activity driven by warming conditions linked to fossil fuel emissions.

The wildfires generated hazardous smoke that spread across both Canada and the United States, affecting major cities including Chicago and New York. This cross-border impact has drawn attention to the issue, particularly after comments by then U.S. President Donald Trump, who expressed frustration over the smoke and suggested punitive measures against Canada for its wildfire management. Trump indicated he planned to announce a response soon, though the specifics remained unclear.

Scientists urged policy makers to recognize the role of global emissions in exacerbating such fire conditions, pointing out that the United States has historically been the largest source of heat-trapping gases responsible for global warming. The consensus among experts is that continued burning of fossil fuels will exacerbate extreme fire weather, posing increased risks to public health and the environment on both sides of the border.