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Climate Expert: What The Media Won’t Tell You About Wildfires

by Roger Pielke Jr.
June 09, 2023, 8:30 AM
in News and Opinion
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forest fireWildfire, common to many healthy ecosystems, is a particularly challenging problem for society because of its impacts on property and health.

It is also challenging because people like to locate themselves in fire-prone places and do things that ignite fires.

We have learned through hard experience that complete suppression of wildfire is not the best policy — despite what Smokey Bear says — as it can lead to even greater and more harmful wildfire events. These dynamics together make wildfire a challenging issue for policy. [emphasis, links added]

This week, wildfire smoke from fires in Canada has drifted south along the eastern seaboard of the United States, affecting New York City and Washington, DC, and correspondingly capturing a lot of media attention.

The event should offer a teachable moment on the complexities of climate and the challenges of adapting to a volatile world.

With this post, I discuss some of the aspects of wildfires that I see as missing in the public discussion.

I start with what the Intergovernmental Panel on Climate Change (IPCC) says about wildfires, discuss readily available data on wildfire trends, and conclude with the complexities of policy in the face of interconnected human-environment dynamics.

The IPCC has not detected or attributed fire occurrence or area burned to human-caused climate change

The IPCC is of course not infallible, but it is essential and always a good first place to start when discussing what is known about extreme events and their impacts.

Many people are surprised when they learn that the IPCC does not evaluate trends in or causes of wildfires.

Instead, the IPCC focuses on “fire weather” which it defines as (emphasis in original):

“Weather conditions conducive to triggering and sustaining wildfires, usually based on a set of indicators and combinations of indicators including temperature, soil moisture, humidity and wind. Fire weather does not include the presence or absence of fuel load. Note: distinct from wildfire occurrence and area burned.”

For a wildfire to occur requires more than just “fire weather” — it also requires fuel and a source of ignition.

In fact, according to the IPCC, the weather is not the most important factor in fire: “Human activities have become the dominant driver.” Indeed, most wildfires are started by human activity.

The IPCC expresses “medium confidence” (about 50-50) that in some regions there are positive trends in conditions of “fire weather”:

“There is medium confidence that weather conditions that promote wildfires (fire weather) have become more probable in southern Europe, northern Eurasia, the USA, and Australia over the last century”

By 2050, the IPCC expects with “high confidence” (about 8/10) that fire weather will increase in only a few regions, as noted by the red circles in the IPCC figure that I annotated below.

IPCC AR6 WG1 Ch.12

The IPCC also identifies when it expects that the “emergence” of a signal of climate change will be detectable for various impact “climate impact drivers.” I have reproduced that table below, with “fire weather” highlighted in blue.

Most people will likely be surprised by the number of white cells in the table — indicating a lack of signal emergence, even out to 2100 and under our old friend RCP8.5.

For “fire weather”, a signal does not emerge through 2100.

IPCC AR6 WG1 Ch.12

Close followers of the IPCC (and my writings on its recent reports) may notice that some of the entries in the table above don’t seem to line up with claims of detection and attribution made elsewhere in the IPCC AR6 — I would agree. But that is an issue for the IPCC.

In short, the IPCC does not provide a basis for strong claims of detection or attribution of “fire weather” to climate change.

The IPCC is silent on trends in fire numbers and [acreage] burned. These conclusions are contrary to almost all media reporting.

Let’s next look at some data.

Globally, emissions from wildfires have decreased over recent decades, as well as in many regions.

Source: Copernicus.eu

The figure above shows that wildfire emissions have declined globally since 2003, based on data from the EU. That doesn’t mean that wildfires have decreased everywhere.

For instance, wildfires have increased over recent decades in the Western United States, France, and Russia. It does mean that claims that wildfire has increased globally in recent decades do not have empirical support, at least by this important and widely accepted metric.

Canada — the focus of extensive fire activity this week polluting the air in the eastern U.S. and elsewhere — has not seen an increase in fire activity in recent decades, as you can see in the figure below, showing official data.

Forest fires in Canada. Source: NFDP

In Quebec specifically, there is also no indication of a long-term increase in fire activity as you can see below, and recent years have been unusually quiet.

Forest fires in Quebec. Source: NFDP

Looking at data from the NFDP, we can see that the majority of fires in Quebec and areas that burned over the past decade are caused by humans, with the balance caused by lightning, as shown in the figure below.

Over the much longer term, going back to 1700, research indicates that recent “burn rates” across Canada in recent decades have been much lower than in centuries past, as you can see in the figure below.

Source: Chavardès et al. 2022

That is a lot of data, I know. What you should take from it is the following:

  • Wildfire globally has decreased in recent decades;
  • Still, some regions have seen increases;
  • Neither Canada nor Quebec has seen such increases this century;
  • Fire incidence across Canada is lower today than in centuries past.

Wildfires are a natural part of ecosystems, [but are they related to climate change, and are they a problem for society]?

Established above is the fact that climate change is expected to affect the environment in which wildfires occur, specifically through enhanced “fire weather” conditions in some locations.

While the IPCC has only medium confidence at present and an expectation that the clear emergence of a signal may take decades, let’s just postulate that climate change has an effect.

OK, now what?

According to one prominent climate scientist, there is only one way that we can manage wildfires, and that is with changes to global energy policy:

The only way to prevent these events from becoming more frequent and more intense is to prevent the continued warming of the planet. And the only way to do that is to decarbonize our economy as rapidly as possible.

That of course is wrong. There are very good reasons to decarbonize the global economy, but doing so to control wildfires and their impacts is not among them.

Fortunately, [many things can be done] to address wildfire risks and their associated impacts.

The OECD has published an excellent report that discusses many of these prevention measures, which are summarized in the figure below:

Given the complexities of the human-environment interconnections related to wildfires, the straightforward detection and attribution framework of the IPCC may not be appropriate or particularly useful.

If a wildfire is to be more than a climate advocacy talking point, we must take seriously the many complexities in their local contexts.

For instance, just today here in Colorado we learned that the Marshall Fire, which consumed more than 1,000 homes just outside Boulder in December 2021, was ignited by a combination of open burning and an arcing power line.

But the disaster was caused by a combination of a wind storm, managed open space with invasive species, a rainfall deficit, decades of land-use decisions that placed neighborhoods alongside combustible lands, homes built of flammable materials, and more.

Sure, say that climate change played a role if that suits you, but after that is said, a far more important discussion has to happen about development and building codes, land use and management, open space, prescribed burns, and so on.

Wildfires are important in many parts of the world. They will become more important as people continue to develop in fire-prone locations and if “fire weather” conditions expand.

The first step in better management of wildfire-prone regions is to understand their complexities, and that means not reducing everything to climate with global energy policy as the only solution.


Roger Pielke Jr. has been a professor at the University of Colorado since 2001. Previously, he was a staff scientist in the Environmental and Societal Impacts Group of the National Center for Atmospheric Research. He has degrees in mathematics, public policy, and political science, and is the author of numerous books. (Amazon).

Read more at The Honest Broker

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Comments 2

  1. Colin Joseph Harkin says:
    2 years ago

    In Australia, we have one maior problem regarding what we call “bush fires” and that’s the regulations set by state governments. Connected to these regulations are areas declared by government called “national parks” and we have many of them.

    What is permitted to happen within these national parks is a huge problem that leads to the cause of bush fires because the land is not managed, people are not permitted to enter in most places and flora grows wild creating a lot of fuel for the next lightening strike.

    An Australian forester named Vic Jurskis wrote a book “Firestick Ecology” – fairdinkum science in plain english. This book is a must-read for anyone wanting to understand the basic causes for wild / bush fires.
    Roger touched on it when he said “For a wildfire to occur requires more than just “fire weather” — it also requires fuel and a source of ignition”.

    In all countries, another factor contributing to wild fires is increasing human populations. There are more of us around including our homes etc., so fires are more likely to impact us and our lives, no matter what. What we need to do is adapt if we live in areas where fires are likely to occur. And, as Roger says, fuel and ingition are the two main things we have some influence over. Not all, because lightening is a big ignition risk all of the time. We can control fuel levels and that is where we fail the most here in Australia.

    Prescribed burns and management of national parks is all on government and as usual, it isn’t attended to as it should. For example, we had large fires south eastern NSW early 2021. Those areas had not been back-burned for decades. In one part, the main highways were closed because fires were burning to edge of the asphalt and people were trapped. Eighteen months later, I drove through that area and large trees (regrowing*) were still near the roadside. They hadn’t been removed to create a fire break, so that people could escape next time a fire occurred.

    Australian gum trees re-grow after bush fires.

  2. SPURWING PLOVER says:
    2 years ago

    What the M.S. Media keeps from us is the Truth about this whole Global/Climate Change its a total excuse for the UN’s Global Government and enforced by the Blue Helmets like with Star wars and the Imperial Storm Troopers

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