Climate Change, Not Forest Management, Doubled Canada's 2026 Wildfire Risk, WWA Study Finds

What the Study Found

WWA researchers analyzed the sustained Daily Severity Rating (DSR)—a metric combining temperature, humidity, wind, and precipitation—and determined that the extreme fire weather conditions were made about twice as likely due to anthropogenic climate change . The fire weather observed, while unusual in today's climate, would have been far rarer in a world without human-induced warming . More than 3.8 million hectares burned, including over 730,000 hectares in Ontario alone .

Imperial College London climate scientist and study co-author Friederike Otto stated: "Time and again we see the same results: climate change is a key driver behind uncontrollably large and unprecedented fires" .

How the Evidence Counters Trump's Claims

President Trump had blamed Canada exclusively, accusing the government of "willful negligence" in forest management and threatening to add the "incalculable cost" of wildfire smoke pollution to existing tariffs on Canadian goods . In a Truth Social post on July 17, 2026, Trump wrote: "We are holding Canada responsible for the fact that they are not properly maintaining their Forests" .

The WWA study directly undercuts that claim by attributing the primary driver of the fire conditions to global climate change—not forest management practices. Fire and climate scientists from both countries noted that while forest management can influence fire behavior at local scales, the extreme weather conditions (record heat, low humidity, and drought) that enabled the fires to spread explosively are fundamentally linked to a warming climate . A FactCheck.org analysis similarly concluded that "climate change — and not a lack of 'Debris Removal,' as Trump suggested — is the main factor leading to worsening Canadian wildfires" .

Some scientists further pointed out that large-scale forest management in Canada's vast boreal forest would be both infeasible and likely ineffective at solving the problem . They also noted the United States' large historical emissions of heat-trapping gases from coal, oil, and gas .

Disproportionate Impact on Indigenous Communities

Although the WWA study primarily focuses on climate attribution, separate data highlighted alongside the study underscores a severe equity gap:

• Indigenous peoples represent about 5% of Canada's population but account for more than 42% of wildfire evacuations .
• Roughly 80% of majority-Indigenous communities in Canada are located in fire-prone regions, making them structurally more exposed .
• A Statistics Canada study released in late July 2026 found that Indigenous peoples face not only higher evacuation rates but also lasting mental and cultural impacts from disrupted access to traditional lands .
• Between 1980 and 2021, 16 communities in Canada were evacuated five or more times due to wildfires, and all but two were First Nations reserves .

The disparity reflects a broader pattern: the populations least responsible for contributing to climate change are often hit hardest by its consequences . Scientists and advocates have pointed out that remote First Nations in northern Ontario and the Northwest Territories have few evacuation alternatives and face chronic underinvestment in fire protection infrastructure, compounding their vulnerability .

In late July 2026, as fires raged, the Canadian military prepared to airlift the remote community of Fort Hope (600 residents) in northwestern Ontario, where some of the most intense fires were burning .