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3w ago

Study Says Human-Caused Warming Doubled Odds of Canada’s Summer Wildfires

The rapid analysis links recent hot, dry and windy conditions to fossil-fuel warming and signals more frequent extreme fire weather in northern boreal regions.

FILE - The Statue of Liberty is visible through haze due to Canadian wildfire smoke during sunset Aug. 5, 2025, in New York. (AP Photo/Yuki Iwamura, File)
Wildfire damage is pictured from the air in the immediate area surrounding Collins First Nation, a small, remote Ojibwa community located in northwestern Ontario, about 250 km north of Thunder Bay, Ont., on Wednesday, July 22, 2026. THE CANADIAN PRESS/Chris Young
FILE - The sun is obscured by wildfire smoke as people stop to photograph the Washington Monument and Lincoln Memorial Reflecting Pool, July 17, 2026, on the National Mall in Washington. (AP Photo/Julia Demaree Nikhinson, File)
Heavy plumes of smoke are seen above the Sleeping Giant in Thunder Bay, Ont., the evening of July 14.

Overview

  • The World Weather Attribution report, released Thursday, Aug. 6, found that human-caused warming roughly doubled the likelihood of the hot, dry and windy 'fire-weather' conditions that drove large fires in Ontario and the Northwest Territories.
  • The study gives early estimates that such extreme conditions could recur every 2–6 years in the Northwest Territories and every 6–15 years in Ontario, compared with much rarer frequencies in a cooler pre-industrial climate.
  • Scientists said lightning ignitions started many of the large northern blazes and that warmer, drier weather let those fires spread too fast to control across remote boreal forests where response windows can be as short as 30 minutes.
  • The season burned millions of hectares, forced thousands of mainly First Nations evacuees from their homes, and sent hazardous smoke across parts of Canada and the northeastern United States, straining provincial resources and prompting federal and international aid.
  • The rapid attribution study has not yet been peer reviewed, and it adds to broader evidence that rising temperatures and longer droughts have increased annual area burned in Canada by about 50% over the past 30 years, raising questions about mitigation and cross-border policy responses.