11Trump Blames Canada, Experts Blame Climate Change
Climate Change Doubled the Risk of Canada’s Massive Summer Wildfires, Study Finds
What Happened?
A new scientific study reveals that human-caused climate change made the hot, dry weather that fueled Canada’s massive summer wildfires twice as likely to happen. The study was released by World Weather Attribution, a group of international scientists who investigate whether extreme weather events carry the "fingerprints" of climate change.
Important Point: This study was done quickly (called a "flash study") and hasn’t gone through formal peer review yet, but the methods used are scientifically accepted and other experts say the findings make sense.
How Did Scientists Figure This Out?
Researchers compared today’s world—which has warmed about 1.4°C (2.5°F) since the Industrial Revolution—to a hypothetical world without that warming. They looked at the specific "fire weather" conditions in two Canadian regions:
| Region | What They Found |
|---|---|
| Northwest Territories | More than 5,000 square miles (12,950 sq km) burned |
| Northwestern Ontario | Weeklong fire-prone conditions now happen roughly every 6 years |
In a pre-industrial climate, those Ontario conditions would have been a "once-in-a-lifetime" event. Now? They’re becoming routine.
The "Tinderbox" Recipe: What Makes Fire Weather?
The Canadian Forest Fire Weather Index tracks four key ingredients:
- Heat – Higher temperatures dry out forests faster
- Lack of Rain – Less moisture in the ground and air
- Low Humidity – Dry air sucks moisture from plants
- Wind – Spreads flames quickly and unpredictably
When all four combine, you get a tinderbox: forests so dry that a single spark—usually lightning—can explode into an unstoppable inferno.
Did You Know? Lightning starts relatively few fires, but it’s responsible for over 90% of the land area burned in Canada. Human-caused fires are more common, but lightning strikes often hit remote areas where firefighters can’t reach quickly.
Trump Blames Canada—Scientists Disagree
What Trump Said
Former President Donald Trump claimed Canada wasn’t managing its forests properly and threatened punishment for sending smoke into the U.S.:
"They’re not managing their forests properly… If they managed their forests, they wouldn’t have the fires." — Trump, July 21
He also mentioned closing businesses in Detroit and Michigan due to smoke.
What Scientists Say
Multiple climate and fire experts say Trump is missing the root cause:
| Argument | Explanation |
|---|---|
| Climate > Management | "What we’re facing here is more of a climate related problem than a forest management problem." — Jonathan Boucher, study co-author |
| U.S. Historical Emissions | The U.S. has contributed more heat-trapping gases historically than any other country. As Andrew Weaver put it: "Smoke does not carry a passport, but carbon pollution does have a history." |
| Canada’s Geography | Much of Canada’s forest is remote, northern, and full of spruce/pine that burns fast. Firefighters often have < 30 minutes to reach a fire before it’s uncontrollable—and many fires start hours from the nearest airport. |
Key Insight: Even with perfect forest management, remote lightning fires in a hotter, drier climate will burn. As Mike Flannigan said: "Mother Nature’s been burning. Now she’s on amphetamines."
How Does This Compare Globally?
The study found similar climate fingerprints elsewhere:
| Location | Increased Likelihood Due to Climate Change |
|---|---|
| Canada (this study) | 2× more likely |
| France (summer fires) | ~2× more likely |
| Spain (recent fires) | 20× more likely |
The signal isn’t equally strong everywhere—but it’s consistently present.
By the Numbers: A Warming North
- Canada has warmed 65% more than the U.S. in recent decades
- Canadian land burned annually: Up ~50% in 30 years
- U.S. land burned annually: More than doubled in the same period
Summary
- Human-caused climate change doubled the likelihood of the extreme fire weather behind Canada’s 2024 summer wildfires.
- The study used peer-reviewed methods to compare today’s climate to a pre-industrial baseline.
- Lightning + hot/dry/windy conditions = massive, hard-to-control fires in remote areas.
- Blaming forest management ignores the bigger picture: the U.S. is historically the largest emitter of the greenhouse gases driving this warming.
- Both countries are burning more land each year—and the trend is accelerating.
Bottom Line: "If you care about anyone but the super rich, you have to stop burning fossil fuels because the impacts are here and they’re now and have huge consequences." — Friederike Otto, study co-author
FAQ
Did climate change cause the fires?
Not directly. Climate change didn’t light the match—but it built the tinderbox. It made the hot, dry, windy conditions twice as likely, so when lightning struck, the forests were primed to explode.
Why can’t Canada just manage its forests better?
Much of the burned area is remote boreal forest—hundreds of kilometers from roads or airports. Firefighters have a ~30-minute window to stop a fire after ignition. In the north, that’s often physically impossible.
Is the U.S. off the hook because the fires were in Canada?
No. Smoke crosses borders, but so does responsibility. The U.S. has emitted more cumulative CO₂ than any nation, driving the global warming that made these fires more likely.
What does "2× more likely" actually mean?
It means the kind of fire weather that used to happen once in a human lifetime now happens every ~6 years in northwestern Ontario. The odds have shifted dramatically.
Has this study been peer-reviewed?
Not yet—it’s a "rapid attribution" study released quickly to inform public debate. However, the methods are standard and peer-reviewed, and outside experts say the conclusions are sound.
This article is based on reporting by The Associated Press. AP’s climate coverage receives support from private foundations; AP is solely responsible for all content.
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