Climate change made Quebec fire weather twice as likely, more intense: study
Climate change has made summers like the kind that led to Quebec's disastrous wildfire season at least seven times more likely to happen again, says a new scientific analysis.
The study by the U.K.-based World Weather Attribution group, released Tuesday, says greenhouse gas emissions made the province's overall fire weather about 50 per cent more conducive to fire between May and June. The very worst days were twice as likely to happen and were about 20 per cent worse than they would have been without current levels of carbon in the air.
The finding should alert governments to the need to reduce emissions and prepare for what's ahead, said one researcher.
"Fire weather risk is increasing due to climate change," said Dorothy Heinrich, one of the report's 17 co-authors. "Adaptation strategies are going to be required to reduce the drivers of risk and decrease their impacts."
Wildfires have occurred in almost every province and territory this summer and have burned more than 137,000 square kilometres — about twice the previous record set in 1995.
Some of the biggest fires happened in Quebec earlier in the season.
By Aug. 16, the province had lost 53,000 square kilometres of forest, including 12,000 square kilometres in a single blaze. Smoke from the fires spread to give Toronto some of the worst air quality in the world and cancelled major league baseball games in New York.
Increased wildfires have long been forecast by climate scientists and, about 20 years ago, scientists began looking for ways to measure the contribution of climate change to individual extreme weather-driven events.
Since then, hundreds of attribution papers have been peer-reviewed and published.
Canada has established its own attribution office. Governments, including the United Kingdom, Australia, the Netherlands, South Korea, Japan and the United States are using attribution science.
- IN PHOTOS: Quebec wildfire season 2023
Attribution science works by comparing climate models. One set of models uses data drawn from actual records while another, otherwise identical, is constructed with the influence of greenhouse gases removed.
Simulations are be run using those two sets and the difference in the results reveals the effects of climate change. It allows scientists to say to what extent the presence of greenhouse gases increased the likelihood of the event in question.
That's what the group did for the Quebec fires, using five different climate models.
The study broke down indicators forest experts use to measure wildfire risk. Those include weather-related measures such as temperature, humidity, wind and precipitation, as well as specialized indices such as fuel moisture and buildup.
Almost all of those measures were pointing to extreme fire hazard, the report says. Canada had the warmest June on record, for example, following a winter that left the second-least snow meltwater since 1950.
"All components of the fire-weather index, when averaged at the national scale, set record values and sometimes by huge margins," says the report.
The hand of climate change was clearly visible in the resulting analysis, the scientists said.
Yan Boulanger, co-author and scientist for the Canadian Forest Service, said it's irrelevant to ask whether the fires were started by fire, accident or arson.
"It takes very dry, very warm or windy conditions to have very, very big fires as we did this year regardless of source (of ignition)," he said. "It is because of weather conditions that those fires spread and it's not a case of ignition sources."
The authors warned the report's conclusions are conservative.
"We are reporting what we consider conservative lower bounds," said co-author Clair Barnes.
Federal Environment Minister Steven Guilbeault said the report's findings show that Canadian jurisdictions need to come together to find solutions on emissions reduction and adaptation.
"(The federal government) can't do everything," he said. "Ensuring there is across-the-board co-operation will be key."
He called the findings a warning.
"The climate impacts we're seeing now are the result of one degree of increasing temperatures. Do people really want to see what a two-degree world looks like?
"If there's one thing climate change won't solve, it's stupidity."
The report suggests that future fiery summers are likely as the climate continues to warm. It points to previous research that looked at earlier periods of the Earth's history to conclude that every degree of warming triples the size of wildfires in Northern Canada.
"The challenges posed by this year's wildfires as well as the projected increases in wildfire weather risk raise important adaptation questions," the report says.
This report by The Canadian Press was first published Aug. 22, 2023.
CTVNews.ca Top Stories
![](https://www.ctvnews.ca/polopoly_fs/1.6970476.1721410082!/httpImage/image.jpg_gen/derivatives/landscape_800/image.jpg)
The CrowdStrike outage is affecting health-care services in Canada. Here's what you need to know
A global technology outage that's grounded flights and delayed border crossings is also challenging health-care services in the country, as issues with Microsoft services persist.
Quebec woman's death warns of dangers of cosmetic surgery abroad
Brian McConnell's daughter, Florence McConnell, died after a liposuction surgery complication in Morocco. Now, he warns others against undergoing cosmetic surgeries abroad.
Interior residents get ready to flee as B.C. fire tally soars past 300
The out-of-control Shetland Creek fire in British Columbia's southern Interior has more than doubled in size due to what the wildfire service describes as "significant overnight growth" and more accurate mapping.
Polar bear 'Baffin' dies at Calgary Zoo after not resurfacing from pool
A polar bear died in its enclosure at the Wilder Institute/Calgary Zoo on Friday.
'I feel cheated': Here are the products hit hardest by shrinkflation
Canadians who feel like they are getting less bang for their buck at the grocery store these days might be right. A new report shows the effects of shrinkflation are real.
Tentative deal to end LCBO strike on hold as province accuses union of introducing new demands
The LCBO strike appears to be back on just hours after a tentative agreement was announced.
Woman guilty of murdering, dismembering boyfriend in Nanaimo, B.C.
A 28-year-old British Columbia woman has been found guilty of killing and dismembering her boyfriend on Vancouver Island nearly four years ago.
opinion Trump's assassination attempt not a political winner
Danger and fear are so pervasive throughout the national political ethos it is now the norm, writes Washington political columnist Eric Ham.
What a Donald Trump presidency means for Canada
The most striking thing about walking the floor of the Republican National Convention (RNC) is seeing just how much this is Donald Trump's party, CTV News' Vassy Kapelos says.