Climate Not Fuels Drive Large Blazes

Active forest management is viewed as a solution to large blazes, but fails to acknowledge that climate is driving wildfire. It is true that if you completely remove forests, you won’t get a forest fire. Photo George Wuerthner 

Proponents of “active forest management” or logging as a means of reducing large wildfires are looking in the rear-view mirror. They continuously argue that frequent low severity fires kept fuels low in the past and precluded large blazes. Thus, their solution to current blazes is fuel reduction—preferably by logging.

The moist cool climate of PNW coastal forests makes wildfire unlikely. Photo George Wuerthner 

Logging proponents fail to acknowledge that climate is the ultimate arbitrator of wildfires. That is why the coastal forests of Oregon and Washington, which contain more “fuel” than any place in the northern Rockies, seldom burn. Why? It’s too cool and moist.

Vegetation responds to climate, and today’s climate is considerably different than even a couple of hundred years ago when we were coming out of the cool, moist climate of the Little Ice Age.

We are in the worse drought in over a thousand years. We are seeing record high temperatures. Average wind speeds are increasing. These factors are responsible for the increase in wildfire spread and severity. For instance, for every 1-degree rise in temperature, fire risk is increased by up to 25%. Wind impact is also exponential, with high winds responsible for every large fire across the West.

Snags from the 1910 Big Burn which charred more than 3 million acres still evident in the proposed Great Burn Wilderness on the Idaho-Montana border. Photo George Wuerthner 

We have historical references demonstrating the correlation between climate and fires—long before anyone can claim “fire suppression” created large fires. For example, the 1910 Big Burn that consumed more than 3 million acres of the Northern Rockies occurred long before anyone could assert that “fire suppression” led to fuel accumulation. And 1929 (i.e., the beginning of the Dust Bowl), as much as 50 million acres were burned across the West. This acreage is five times what we now call a record year if 10 million acres burn.

A mid century cool, moist period 1940-1980 led to a decline in fire igntions and fire spread which many use as the “norm” for fire behavior. Nature (climate) did a good job of fire suppression. 

However, our view is skewed by a decline in fires in the mid-century between the 1940s-1980s. Some logging proponents assert that “fire suppression led to fuel accumulations. In reality, the West was in the midst of a cycle of cool, moist conditions, which resulted in few ignitions and limited fire spread, and glaciers were growing in the PNW. During this period, Nature (climate) did a fine job suppressing fires, but in typical human arrogance, we try to take credit for it.

Medical facility in Paradise, California burned by the Camp Fire. Photo George Wuerthner 

Furthermore, there is abundant evidence from large blazes around the West that logging does not preclude large blazes. For example, the town of Paradise, California, which the Camp Fire consumed, was surrounded by clearcuts, hazardous fuel reduction projects, and even two previous fires-all of which “reduced” fuels, yet propelled by 60 mph winds, the fire spread as fast as one football field a second.

The area burned by the Holiday Farm Fire in 2020 was under “active forest management.” (Google Earth)

The Holiday Farm Fire charred the western slopes of the Oregon Cascades in 2020; the Dixie Fire, California’s largest blaze, and Bootleg Fire in Oregon were respectfully the largest blazes last year in each state, burned through substantial areas of past logging. Here’s a link to a Google Earth view of clearcuts that made up the bulk of the area charred by the Holiday Farm fire.

Numerous studies confirm that climate drives large blazes and logging exacerbates fire spread, and recently more than 200 scientists sent a letter to Congress.

Dry montane forests of ponderoa pine and Douglas fir compise approximately 4% of the forests in the northern Rockies. Mosf ot the acreage burned in Idaho and Montana is not dry forests, but higher elevation forests that tend to naturally burn at mixed to high severity. Photo George Wuerthner 

Though much made by ill-informed commentators who argue that fuel build-up due to alleged fire suppression in low elevation pine and Doug fir has created the current situation for large blazes. However, dry montane forests dominated by ponderosa pine and Douglas fir make up only 4% of northern Idaho and western Montana forests. Therefore, even if fire suppression had led to a fuel build-up, these forests could not be responsible for the massive acres being burned since they make up a small percentage of all forest types.

The Wood Products Industry (green)  is the largest contributor to GHG emissions in Oregon. 

The irony of logging as a cure for large wildfires is that the wood products industry significantly contributes to Greenhouse Gas Emissions. For instance, 35% of the GHG emissions in Oregon are due to the logging industry. Thus, more logging only puts more CO2 into the atmosphere resulting in even greater climate warming.

Spending funds logging forests in the false hope that one can reduce large blazes are looking in the rear-view mirror. Unless we reduce GHG emissions, we will continue to see large blazes driven by climate warming. In the meantime, rather than log our forests, the best way to protect communities and structures is home hardening working from home outward.


  1. Jannett Heckert Avatar
    Jannett Heckert

    Does Forest maintenance help during forest fires. Prior to a forest fire, does clearing dead timber, dead falls and allowing horses and cattle to eat ground growth under the trees improve the situation?

    Why are forest services still using controlled burning, also known as prescribed burning, involves setting planned fires to maintain the health of a forest, when the forests are so dry? Some have gotten out of their control.

    1. Ralph Maughan Avatar
      Ralph Maughan

      Just to recall very recent history. This is from National Public Radio: “In New Mexico, the massive Calf Canyon-Hermits Peaks Fire is now officially the state’s largest recorded wildfire in modern history, eclipsing the 297,845 acre Whitewater-Baldy Fire Complex of 2012. On Monday morning fire officials listed Calf Canyon-Hermits peak at 298,060 acres.

      What was the cause of this jumbo fire? It was a planned burn to reduce the risk of wildlife. The planned burn escaped its containment lines.”
      . . . . . . . . . . . . .

      “Planned burns, or prescribed fires, are important wildfire management tools that burn vegetation to limit the potential fuel for such blazes. It is rare for them to grow out of control, officials said.” Oh yeh!


George Wuerthner is an ecologist and writer who has published 38 books on various topics related to environmental and natural history. He has visited over 400 designated wilderness areas and over 200 national park units.

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George Wuerthner