This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:

fact-checked

reputable news agency

proofread

Fight fire with fire: controlled burns stem California blazes

Firefighters with California State Parks monitor a prescribed burn at Wilder Ranch State Park near Santa Cruz, California, in October 2023.
Firefighters with California State Parks monitor a prescribed burn at Wilder Ranch State Park near Santa Cruz, California, in October 2023.

In a forest in northern California, a line of people spread out through the trees, setting fire to shrubs and fallen branches in an act of intentional arson aimed at making the woodland better able to cope with future conflagrations.

The operation near Santa Cruz is part of a growing number of prescribed burns intended to reduce the amount of fuel that can feed natural wildfires in an era when human-caused climate change is increasing the likelihood of devastating blazes.

"The best way to fight is with fire," says Portia Halbert, senior environmental scientist with California State Parks, who is supervising the burn.

"It's not a matter of it burns, but it burns: it's going to burn eventually. And so we want to burn it... when it's not going to be so extreme that it burns down people's homes and causes loss of life and property."

Before the undergrowth is ignited, the earth is turned with shovels to create a containment line.

Branches and shrubs too close to fully grown trees are removed, and hoses are deployed to stop flames from getting out of control.

The idea is to encourage the fire to consume only the , without spreading to the oaks and redwoods that loom over it.

When wildfire breaks out in the future—as it certainly will—it will have less fuel and will burn cooler and slower, without spreading to the tree tops.

Native American practice

After around 20 years of drought and in a climate that is slowly aridifying, California has seen an alarming number of megafires over the last decade.

These blazes have destroyed millions of acres (hectares) of forest, killed over 200 people and wrought hundreds of millions of dollars of damage.

Volunteer crews clear brush around Redwood trees before a prescribed burn at Wilder Ranch State Park near Santa Cruz, California, in October 2023
Volunteer crews clear brush around Redwood trees before a prescribed burn at Wilder Ranch State Park near Santa Cruz, California, in October 2023.

The scale and cost of these blazes has brought about an understanding that California's long-established policy of stamping out wildfires as soon as they break out is wrongheaded and counterproductive.

With firefighters having rushed to quell blazes as soon as they could, forests have been transformed into fuel-stuffed tinderboxes—with disastrous consequences when fires inevitably get out of control.

Forest managers now understand what Native Americans long knew—controlled burns are key to successful management.

Around 20 different organizations are now aiming to a total of 160,000 hectares a year by 2025.

But, says Jared Childress of the Central Coast Prescribed Burn Association, which is involved in the Santa Cruz controlled fire, that figure is nowhere near enough.

"We need to scale this up," he said. "We need to be doing burns exactly like this, all throughout California, throughout the fall, throughout the winter, throughout the spring, even in early summer.

"We're nowhere near the level that we need to be, both ecologically and also from changing the wildfire dynamic."

'Artful'

At present, the windows granted by the authorities for these operations remain very narrow.

The nervousness to fully embrace a practice that many land managers see as vital could stem from perceived risk.

While most controlled go off without a hitch, they occasionally go wrong—like one in New Mexico in the autumn of 2022 that ended up destroying hundreds of homes.

Prescribed burns are used to prevent wildfires getting out of control, a Native American technique that is coming into its own in an era of  climate change
Prescribed burns are used to prevent wildfires getting out of control, a Native American technique that is coming into its own in an era of climate change.

Lenya Quinn-Davidson, a specialist in controlled fire at the University of California, says it is a specialized area,

"Prescribed fire is a very artful, thoughtful practice," she told AFP.

"So it's not the kind of thing where you can just hire someone and then they can come in and just start prescribed burning, you have to really have a lot of training and experience."

Nonetheless, the amount of land burned each year has to rise dramatically, if the catastrophic wildfires that have torn through parts of California and other western states in recent years are to be avoided.

"There have been some historical reconstructions of fire regimes and pre-European settlement, (showing) anywhere from four to 11 million acres burned every year" in California, Quinn-Davidson said.

In comparison, "our landscapes are starved for fire."

In the outside Santa Cruz, ecology student Ian Cook was among those learning how best to use this powerful tool, working on weather reports to help teams understand how the flames will move when they are set.

For him, it's a huge collaborative effort that is needed to sieze control of the issue and to try to prevent the vast destructive blazes of recent years.

"We'll have to work together," he says.

"Because this is a problem that affects all of us."

© 2023 AFP

Citation: Fight fire with fire: controlled burns stem California blazes (2023, November 13) retrieved 20 May 2024 from https://phys.org/news/2023-11-stem-california-blazes.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Research recommends extending California's prescribed burning season

1 shares

Feedback to editors