Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Climate

Wildfire Smoke Deaths Are Spiking as the Planet Warms

New research out today shows a 10-fold increase in smoke mortality related to climate change from the 1960s to the 2010.

A skull in fire.
Heatmap Illustration/Getty Images

If you are one of the more than 2 billion people on Earth who have inhaled wildfire smoke, then you know firsthand that it is nasty stuff. It makes your eyes sting and your throat sore and raw; breathe in smoke for long enough, and you might get a headache or start to wheeze. Maybe you’ll have an asthma attack and end up in the emergency room. Or maybe, in the days or weeks afterward, you’ll suffer from a stroke or heart attack that you wouldn’t have had otherwise.

Researchers are increasingly convinced that the tiny, inhalable particulate matter in wildfire smoke, known as PM2.5, contributes to thousands of excess deaths annually in the United States alone. But is it fair to link those deaths directly to climate change?

A new study published Monday in Nature Climate Change suggests that for a growing number of cases, the answer should be yes. Chae Yeon Park, a climate risk modeling researcher at Japan’s National Institute for Environmental Studies, looked with her colleagues at three fire-vegetation models to understand how hazardous emissions changed from 1960 to 2019, compared to a hypothetical control model that excluded historical climate change data. They found that while fewer than 669 deaths in the 1960s could be attributed to climate change globally, that number ballooned to 12,566 in the 2010s — roughly a 20-fold increase. The proportion of all global PM2.5 deaths attributable to climate change jumped 10-fold over the same period, from 1.2% in the 1960s to 12.8% in the 2010s.

“It’s a timely and meaningful study that informs the public and the government about the dangers of wildfire smoke and how climate change is contributing to that,” Yiqun Ma, who researches the intersection of climate change, air pollution, and human health at the Yale School of Medicine, and who was not involved in the Nature study, told me.

The study found the highest climate change-attributable fire mortality values in South America, Australia, and Europe, where increases in heat and decreases in humidity were also the greatest. In the southern hemisphere of South America, for example, the authors wrote that fire mortalities attributable to climate change increased from a model average of 35% to 71% between the 1960s and 2010s, “coinciding with decreased relative humidity,” which dries out fire fuels. For the same reason, an increase in relative humidity lowered fire mortality in other regions, such as South Asia. North America exhibited a less dramatic leap in climate-related smoke mortalities, with climate change’s contribution around 3.6% in the 1960s, “with a notable rise in the 2010s” to 18.8%, Park told me in an email.

While that’s alarming all on its own, Ma told me there was a possibility that Park’s findings might actually be too conservative. “They assume PM2.5 from wildfire sources and from other sources” — like from cars or power plants — “have the same toxicity,” she explained. “But in fact, in recent studies, people have found PM2.5 from fire sources can be more toxic than those from an urban background.” Another reason Ma suspected the study’s numbers might be an underestimate was because the researchers focused on only six diseases that have known links to PM2.5 exposure: chronic obstructive pulmonary disease, lung cancer, coronary heart disease, type 2 diabetes, stroke, and lower respiratory infection. “According to our previous findings [at the Yale School of Medicine], other diseases can also be influenced by wildfire smoke, such as mental disorders, depression, and anxiety, and they did not consider that part,” she told me.

Minghao Qiu, an assistant professor at Stony Brook University and one of the country’s leading researchers on wildfire smoke exposure and climate change, generally agreed with Park’s findings, but cautioned that there is “a lot of uncertainty in the underlying numbers” in part because, intrinsically, wildfire smoke exposure is such a complicated thing to try to put firm numbers to. “It’s so difficult to model how climate influences wildfire because wildfire is such an idiosyncratic process and it’s so random, ” he told me, adding, “In general, models are not great in terms of capturing wildfire.”

Despite their few reservations, both Qiu and Ma emphasized the importance of studies like Park’s. “There are no really good solutions” to reduce wildfire PM2.5 exposure. You can’t just “put a filter on a stack” as you (sort of) can with power plant emissions, Qiu pointed out.

Even prescribed fires, often touted as an important wildfire mitigation technique, still produce smoke. Park’s team acknowledged that a whole suite of options would be needed to minimize future wildfire deaths, ranging from fire-resilient forest and urban planning to PM2.5 treatment advances in hospitals. And, of course, there is addressing the root cause of the increased mortality to begin with: our warming climate.

“To respond to these long-term changes,” Park told me, “it is crucial to gradually modify our system.”

You’re out of free articles.

Subscribe today to experience Heatmap’s expert analysis 
of climate change, clean energy, and sustainability.
To continue reading
Create a free account or sign in to unlock more free articles.
or
Please enter an email address
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
Energy

AM Briefing: Power Hungry

On the IEAs latest report, flooding in LA, and Bill Gates’ bad news

Global Electricity Use Is Expected to Soar
Heatmap Illustration/Getty Images

Current conditions: Severe thunderstorms tomorrow could spawn tornadoes in Mississippi, Louisiana, Arkansas, and Alabama • A massive wildfire on a biodiverse island in the Indian Ocean has been burning for nearly a month, threatening wildlife • Tropical Cyclone Zelia has made landfall in Western Australia with winds up to 180mph.

THE TOP FIVE

1. Breakthrough Energy to slash climate grantmaking budget

Bill Gates’ climate tech advocacy organization has told its partners that it will slash its grantmaking budget this year, dealing a blow to climate-focused policy and advocacy groups that relied on the Microsoft founder, Heatmap’s Katie Brigham has learned. Breakthrough Energy, the umbrella organization for Gates’ various climate-focused programs, alerted many nonprofit grantees earlier this month that it would not be renewing its support for them. This pullback will not affect Breakthrough’s $3.5 billion climate-focused venture capital arm, Breakthrough Energy Ventures, which funds an extensive portfolio of climate tech companies. Breakthrough’s fellowship program, which provides early-stage climate tech leaders with funding and assistance, will also remain intact, a spokesperson confirmed. They would not comment on whether this change will lead to layoffs at Breakthrough Energy.

Keep reading...Show less
Yellow
Climate Tech

Breakthrough Energy Is Slashing Its Climate Grantmaking Budget

Grantees told Heatmap they were informed that Bill Gates’ climate funding organization would not renew its support.

Bill Gates.
Heatmap Illustration/Getty Images

Bill Gates’ climate tech advocacy organization has told its partners that it will slash its grantmaking budget this year, dealing a blow to climate-focused policy and advocacy groups that relied on the Microsoft founder, Heatmap has learned.

Breakthrough Energy, the umbrella organization for Gates’ various climate-focused programs, alerted many nonprofit grantees earlier this month that it would not be renewing its support for them. This pullback will not affect Breakthrough’s $3.5 billion climate-focused venture capital arm, Breakthrough Energy Ventures, which funds an extensive portfolio of climate tech companies. Breakthrough’s fellowship program, which provides early-stage climate tech leaders with funding and assistance, will also remain intact, a spokesperson confirmed. They would not comment on whether this change will lead to layoffs at Breakthrough Energy.

Keep reading...Show less
Blue
Spotlight

Anti-Wind Activists Have a Big Ask for the Big Man

The Trump administration is now being lobbied to nix offshore wind projects already under construction.

Trump and offshore wind.
Getty Images / Heatmap Illustration

Anti-wind activists have joined with well-connected figures in conservative legal and energy circles to privately lobby the Trump administration to undo permitting decisions by the National Oceanic and Atmospheric Administration, according to documents obtained by Heatmap.

Representatives of conservative think tanks and legal nonprofits — including the Caesar Rodney Institute, the Heartland Institute and Committee for a Constructive Tomorrow, or CFACT — sent a letter to Interior Secretary Doug Burgum dated February 11 requesting that the Trump administration “immediately revoke” letters from NOAA to 11 offshore wind projects authorizing “incidental takes,” a term of regulatory art referencing accidental and permissible harassment, injury, or potential deaths under federal endangered species and mammal protection laws. The letter lays out a number of perceived issues with how those approvals have historically been issued for offshore wind companies and claims the government has improperly analyzed the cumulative effects of adding offshore wind to the ocean’s existing industrialization. NOAA oversees marine species protection.

Keep reading...Show less