Science
California needs biomass energy to meet its wildfire goals. Its projects keep going South
Arbor Energy is, essentially, a poster child of the kind of biomass energy project California keeps saying it wants.
The state’s goal is to reduce wildfire risk on 1 million acres of wildlands every year, including by thinning overgrown forests, which is expected to generate roughly 10 million tons of wood waste annually. Arbor hopes to take that waste, blast it through a “vegetarian rocket engine” to produce energy, then sequester all of the carbon the process would generate underground.
California has billed Arbor — and the handful of other similarly aimed projects it’s financed — as a win-win-win: wildfire mitigation, clean energy and carbon sequestration all in one.
Yet, after Arbor initially won state financial backing for a pilot project in Placer County, the El Segundo-based company’s California ambitions fell through, like many biomass projects before it.
Instead, it’s heading to Louisiana.
California, biomass energy advocates say, has struggled to get past its distrust of the technology, given traditional biomass’ checkered past of clear-cutting forests and polluting poorer communities. Further, the state’s strict permitting requirements have given residents tremendous power to veto projects and created regulatory headaches.
But many environmental groups argue it’s an example of California’s environmental and health protections actually working. If not done carefully, bioenergy projects run the risk of emitting carbon — not sequestering it — and polluting communities already grappling with some of the state’s dirtiest air.
“When you look at biomass facilities across California — and we’ve done Public Records Act requests to look at emissions, violations and exceedances … the reality is that we’re not in some kind of idealized pen-and-paper drawing of what the equipment does,” said Shaye Wolf, climate science director at the Center for Biological Diversity. “In the real world, there are just too many problems with failures and faults in the equipment.”
There are simpler and safer uses for this wood waste, these critics say: fertilizer for agriculture, wood chips and mulch. It may not provide carbon-negative energy but comes with none of the risks of bioenergy projects, they say.
For the record:
11:51 a.m. Sept. 30, 2025A previous version of this story stated that the Center for Biological Diversity advocated for a wildfire approach involving only home hardening and evacuation planning. Its proposal also includes prescribed burning and defensible-space vegetation management.
The Center for Biological Diversity and others advocate for a more “hands-off” approach to California’s forests and urge management of the wildfire crisis primarily through home hardening, evacuation planning, prescribed burning and defensible-space vegetation management. But fire and ecology experts say more than a century of fire suppression has made that unrealistic.
However, the sweeping forest-thinning projects these experts say are needed will cost billions, and so the state needs every source of funding it can get. “Our bottleneck right now is, how do we pay for treating a million acres a year?” said Deputy Chief John McCarthy of the California Department of Forestry and Fire Protection, who oversees the agency’s wood products and bioenergy program.
In theory, the class of next-generation biomass energy proposals popping up across California could help fund this work.
“California has an incredible opportunity,” said Arbor chief executive and co-founder Brad Hartwig. With the state’s leftover biomass from forest thinning, “we could make it basically the leader in carbon removal in the world.”
A lot of wood with nowhere to go
Biomass energy first took off in California in the 1980s after small pioneering plants at sawmills and food-processing facilities proved successful and the state’s utilities began offering favorable contracts for energy sources they deemed “renewable” — a category that included biomass.
In the late ‘80s and early ‘90s, the state had more than 60 operating biomass plants, providing up to 9% of the state’s residential power. Researchers estimate the industry supported about 60,000 acres of forest treatment to reduce wildfire risk per year at the time. But biomass energy’s heyday was short-lived.
In 1994, the California Public Utilities Commission shifted the state’s emphasis away from creating a renewable and diverse energy mix and toward simply buying the cheapest possible power.
Biomass — an inherently more expensive endeavor — struggled. Many plants took buyouts to shut down early. Despite California’s repeated attempts to revitalize the industry, the number of biomass plants continued to dwindle.
Today, only 23 biomass plants remain in operation, according to the industry advocate group California Biomass Energy Alliance. The state Energy Commission expects the number to continue declining because of aging infrastructure and a poor bioenergy market. California’s forest and wildfire leadership are trying to change that.
In 2021, Gov. Gavin Newsom created a task force to address California’s growing wildfire crisis. After convening the state’s top wildfire and forest scientists, the task force quickly came to a daunting conclusion: The more than a century of fire suppression in California’s forests — especially in the Sierra Nevada — had dramatically increased their density, providing fires with ample fuel to explode into raging beasts.
To solve it, the state needed to rapidly remove that extra biomass on hundreds of thousands, if not millions, of acres of wildlands every year through a combination of prescribed burns, rehabilitation of burned areas and mechanically thinning the forest.
McCarthy estimated treating a single acre of land could cost $2,000 to $3,000. At a million acres a year, that’s $2 billion to $3 billion annually.
“Where is that going to come from?” McCarthy said. “Grants — maybe $200 million … 10% of the whole thing. So, we need markets. We need some sort of way to pay for this stuff and in a nontraditional way.”
McCarthy believes bioenergy is one of those ways — essentially, by selling the least valuable, borderline unusable vegetation from the forest floor. You can’t build a house with pine cones, needles and twigs, but you can power a bioenergy plant.
However, while biomass energy has surged in Southern states such as Georgia, projects in California have struggled to get off the ground.
In 2022, a bid by Chevron, Microsoft and the oil-drilling technology company Schlumberger to revive a traditional biomass plant near Fresno and affix carbon capture to it fell through after the U.S. Environmental Protection Agency requested the project withdraw its permit application. Environmental groups including the Center for Biological Diversity and residents in nearby Mendota opposed the project.
This year, a sweeping effort supported by rural Northern California counties to process more than 1 million tons of biomass a year into wood pellets and ship them to European bioenergy plants (with no carbon capture involved) in effect died after facing pushback from watch groups that feared the project, led by Golden State Natural Resources, would harm forests, and environmental justice groups that worried processing facilities at the Port of Stockton would worsen the air quality in one of the state’s most polluted communities.
Arbor believed its fate would be different.
Bioenergy from the ground up
Before founding Arbor, Hartwig served in the California Air National Guard for six years and on a Marin County search and rescue team. He now recalls a common refrain on the job: “There is no rescue in fire. It’s all search,” Hartwig said. “It’s looking for bodies — not even bodies, it’s teeth and bones.”
In 2022, he started Arbor, with the idea of taking a different approach to bioenergy than the biomass plants shuttering across California.
To understand Arbor’s innovation, start with coal plants, which burn fossil fuels to heat up water and produce steam that turns a turbine to generate electricity. Traditional biomass plants work essentially the same but replace coal with vegetation as the fuel. Typically, the smoke from the vegetation burning is simply released into the air.
Small detail of the 16,000-pound proof-of-concept system being tested by Arbor that will burn biomass, capture carbon dioxide and generate electricity.
(Myung J. Chun/Los Angeles Times)
Arbor’s solution is more like a tree-powered rocket engine.
The company can utilize virtually any form of biomass, from wood to sticks to pine needles and brush. Arbor heats it to extreme temperatures and deprives it of enough oxygen to make the biomass fully combust. The organic waste separates into a flammable gas — made of carbon monoxide, carbon dioxide, methane and hydrogen — and a small amount of solid waste.
The machine then combusts the gas at extreme temperatures and pressures, which then accelerates a turbine at much higher rates than typical biomass plants. The resulting carbon dioxide exhaust is then sequestered underground.
Arbor portrays its solution as a flexible, carbon-negative and clean device: It can operate anywhere with a hookup for carbon sequestration. Multiple units can work together for extra power. All of the carbon in the trees and twigs the machine ingests ends up in the ground — not back in the air.
But biomass watchdogs warn previous attempts at technology like Arbor’s have fallen short.
This biomass process creates a dry, flaky ash mainly composed of minerals — essentially everything in the original biomass that wasn’t “bio” — that can include heavy metals that the dead plants sucked up from the air or soil. If agricultural or construction waste is used, it can include nasty chemicals from wood treatments and pesticides.
Arbor plans — at least initially — on using woody biomass directly from the forest, which typically contains less of these dangerous ash chemicals.
Turning wood waste into gas also generates a thick, black tar composed of volatile organic compounds — which are also common contaminants following wildfires. The company says its gasification process uses high enough temperatures to break down the troublesome tar, but researchers say tar is an inevitable byproduct of this process.
Grant Niccum, left, Arbor lead systems engineer and Kevin Saboda, systems engineer, at the company‘s test site in San Bernardino. Biomass is fed into this component and then compressed to 100 times atmospheric pressure and burned to create a synthetic gas.
(Myung J. Chun / Los Angeles Times)
Watchdogs also caution that the math to determine whether bioenergy projects sequester or release carbon is complicated and finicky.
“Biomass is tricky, and there’s a million exceptions to every rule that need to be accounted for,” said Zeke Hausfather, climate research lead with Frontier Climate, which vets carbon capture projects such as Arbor’s and connects them with companies interested in buying carbon credits. “There are examples where we have found a project that actually works on the carbon accounting math, but we didn’t want to do it because it was touching Canadian boreal forest that’s old-growth forest.”
Frontier Climate, along with the company Isometric, audits Arbor’s technology and operations. However, critics note that because both companies ultimately support the sale of carbon credits, their assessments may be biased.
At worst, biomass projects can decimate forests and release their stored carbon into the atmosphere. Arbor hopes, instead, to be a best-case scenario: improving — or at least maintaining — forest health and stuffing carbon underground.
When it all goes South
Arbor had initially planned to build a proof of concept in Placer County. To do it, Arbor won $2 million through McCarthy’s Cal Fire program and $500,000 through a state Department of Conservation program in 2023.
But as California fell into a deficit in 2023, state funding dried up.
So Arbor turned to private investors. In September 2024, Arbor reached an agreement with Microsoft in which the technology company would buy carbon credits backed by Arbor’s sequestration. In July of this year, the company announced a $41-million deal (well over 15 times the funding it ever received from California) with Frontier Climate, whose carbon credit buyers include Google, the online payment company Stripe and Meta, which owns Instagram and Facebook.
To fulfill the credits, it would build its first commercial facility near Lake Charles, La., in part powering nearby data centers.
“We were very excited about Arbor,” McCarthy said. “They pretty much walked away from their grant and said they’re not going to do this in California. … We were disappointed in that.”
But for Arbor, relying on the state was no longer feasible.
“We can’t rely on California for the money to develop the technology and deploy the initial systems,” said Hartwig, standing in Arbor’s plant-covered El Segundo office. “For a lot of reasons, it makes sense to go test the machine, improve the technology in the market elsewhere before we actually get to do deployments in California, which is a much more difficult permitting and regulatory environment.”
Rigger Arturo Hernandez, left, and systems engineer Kevin Saboda secure Arbor’s proof-of-concept system in the company’s San Bernardino test site after its journey from Arbor’s headquarters in El Segundo. The steel frame was welded in Texas while the valves, tubing and other hardware were installed in El Segundo.
(Myung J. Chun/Los Angeles Times)
It’s not the first next-generation biomass company based in California to build elsewhere. San Francisco-based Charm Industrial, whose technology doesn’t involve energy generation, began its sequestration efforts in the Midwest and plans to expand into Louisiana.
The American South has less stringent logging and environmental regulations, which has led biomass energy projects to flock to the area: In 2024, about 2.3% of the South’s energy came from woody biomass — up from 2% in 2010, according to the U.S. Energy Information Administration. Meanwhile, that number on the West Coast was only 1.2%, continuing on its slow decline.
And, unlike in the West, companies aiming to create wood pellets to ship abroad have proliferated in the South. In 2024, the U.S. produced more than 10.7 million tons of biomass pellets; 82% of which was exported. That’s up from virtually zero in 2000. The vast majority of the biomass pellets produced last year — 84% — was from the South.
Watchdogs warn that this lack of guardrails has allowed the biomass industry to harm the South’s forests, pollute poor communities living near biomass facilities and fall short of its climate claims.
Over the last five years, Drax — a company that harvests and exports wood pellets and was working with Golden State Natural Resources — has had to pay Louisiana and Mississippi a combined $5 million for violating air pollution laws. Residents living next to biomass plants, like Drax’s, say the operations have worsened asthma and routinely leave a film of dust on their cars.
But operating a traditional biomass facility or shipping wood pellets to Europe wasn’t Arbor’s founding goal — albeit powering data centers in the American South wasn’t exactly either.
Hartwig, who grew up in the Golden State, hopes Arbor’s technology can someday return to California to help finance the solution for the wildfire crisis he spent so many years facing head-on.
“We’ve got an interest in Arkansas, in Texas, all the way up to Minnesota,” Hartwig said. “Eventually, we’d like to come back to California.”
Science
Very little plastic being recycled in California as state efforts falter
California touts itself as a leader on the problem of plastic garbage, but recent developments suggest otherwise.
A new report issued by the state’s waste agency shows plastic yogurt containers, shampoo bottles and restaurant takeout trays are being recycled at rates only in the single digits.
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Polypropylene, labeled as #5 on packaging, is used for yogurt containers, margarine tubs and microwavable trays. Only 2% of it is getting recycled. Colored shampoo and detergent bottles, made from polyethylene, or #1 plastic, are getting recycled at a rate of just 5%.
Other plastics, including ones promoted as highly recyclable, such as clear polyethylene bottles, which hold some medications, or hard water bottles, are being recycled at just 16%.
No plastic in the report exceeds a recycling rate of 23%, with the majority reported in just the single digits.
Adding to this disquieting assessment, CalRecycle also just pulled back regulations that were supposed to finalize a landmark single-use plastic law known as Senate Bill 54 — a law designed to make the majority of packaging waste in the state recyclable or compostable by working with the plastic and packaging industries.
The report and delay have sparked a wide variety of reactions by those who have closely watched the law as it was written and implemented.
The proposed regulations were regarded as friendly to industry. As a result, some are hopeful that CalRecycle’s decision to pull them back for tweaking means the agency will make the law stronger. Others say the two developments just show the state has never really been serious about plastic recycling.
“California’s SB 54 … will NEVER increase the recycling rates of these items … because cartons and plastic packaging are fundamentally not technically or economically recyclable,” said Jan Dell, the founder of Orange County-based Last Beach Cleanup, an anti-plastic organization.
Industry representatives are also expressing disappointment, saying the more delays and changes the state makes, the harder it is “for California businesses to comply with the law and implement the resulting changes,” said John Myers, a spokesman for the California Chamber of Commerce, which represents companies that will be affected.
Reports on abysmally low rates of recycling for milk cartons and polystyrene have been widely shared and known. But the newest numbers were still a grim confirmation that there are few options for dealing with these materials.
According to one state analysis, 2.9 million tons of single-use plastic and 171.4 billion single-use plastic components were sold, offered for sale or distributed in California in 2023.
Single-use plastics and plastic waste more broadly are considered a growing environmental and health problem. In recent decades, plastic waste has overwhelmed waterways and oceans, sickening marine life and threatening human health.
Last spring, the Newsom administration was accused of neutering the regulations that CalRecycle had initially proposed to implement the law. The changes excluded all packaging material related to produce, meat, dairy products, dog food, toothpaste, condoms, shampoo and cereal boxes, among other products. These are all products that might fall under the purview of the U.S. Food and Drug Administration and the U.S. Department of Agriculture.
It also opened the door to “alternative” recycling, such as chemical recycling, which environmentalists say is polluting, and was banned in the language of the law.
The waste agency then submitted those draft regulations to the Office of Administrative Law, whose lawyers and staff review proposed regulations to ensure they are “clear, necessary, legally valid, and available to the public” before finalizing them. They were set to release their determination on Friday; CalRecycle pulled the regulations back before the office issued its determination.
Neither the law office nor governor’s office responded to requests for comment.
Melanie Turner, CalRecycle’s spokeswoman, said the agency withdrew its proposed regulations “to make changes … to improve clarity and support successful implementation of the law,” and its revisions were focused on areas that dealt with “food and agricultural commodities.”
California State Sen. Ben Allen (D-Santa Monica), author of the original legislation, called the delay “entirely avoidable” in a statement, but said it would allow CalRecycle an “opportunity to ensure the regulations truly follow the law as it was signed.”
He urged the waste agency and Newsom’s administration not to “allow broad, sweeping exemptions that would undermine the program and increase costs for ratepayers.”
Critics of the watered-down regulations, such as Anja Brandon, the director of plastics policy for the Ocean Conservancy, said she wasn’t surprised by the withdrawal.
The proposed regulations “would have gone beyond CalRecycle’s authority by creating a sweeping categorical exclusion for food and agricultural packaging — effectively a loophole that would have allowed producers to continue putting vast amounts of plastic packaging into the marketplace, completely undermining SB 54’s goals and success,” she said in a text message.
Turner said CalRecycle will conduct a 15-day comment period — although when that begins has not yet been divulged.
Science
Cancer survival rates soar nationwide, but L.A. doctors warn cultural and educational barriers leave some behind
The American Cancer Society’s 2026 Cancer Statistics report, released Tuesday, marks a major milestone for U.S. cancer survival rates. For the first time, the annual report shows that 70% of Americans diagnosed with cancer can expect to live at least five years, compared with just 49% in the mid-1970s.
The new findings, based on data from national cancer records and death statistics from 2015 to 2021, also show promising progress in survival rates for people with the deadliest, most advanced and hardest-to-treat cancers when compared with rates from the mid-1990s. The five-year survival rate for myeloma, for example, nearly doubled (from 32% to 62%). The survival rate for liver cancer tripled (from 7% to 22%), for late-stage lung cancer nearly doubled (from 20% to 37%), and for both melanoma and rectal cancer more than doubled (from 16% to 35% and from 8% to 18%, respectively).
For all cancers, the five-year survival rate more than doubled since the mid-1990s, rising from 17% to 35%.
This also signals a 34% drop in cancer mortality since 1991, translating to an estimated 4.8 million fewer cancer deaths between 1991 and 2023. These significant public health advances result from years of public investment in research, early detection and prevention, and improved cancer treatment, according to the report.
“This stunning victory is largely the result of decades of cancer research that provided clinicians with the tools to treat the disease more effectively, turning many cancers from a death sentence into a chronic disease,” said Rebecca Siegel, senior scientific director at the American Cancer Society and lead author of the report.
As more people survive cancer, there is also a growing focus on the quality of life after treatment. Patients, families and caregivers face physical, financial and emotional challenges. Dr. William Dahut, the American Cancer Society’s chief scientific officer, said that ongoing innovation must go hand in hand with better support services and policies, so all survivors — not just the privileged — can have “not only more days, but better days.”
Indeed, the report also shows that not everyone has benefited equally from the advances of the last few decades. American Indian and Alaska Native people now have the highest cancer death rates in the country, with deaths from kidney, liver, stomach and cervical cancers about double that of white Americans.
Additionally, Black women are more likely to die from breast and uterine cancers than non-Black women — and Black men have the highest cancer rates of any American demographic. The report connects these disparities in survival to long-standing issues such as income inequity and the effects of past discrimination, such as redlining, affecting where people live — forcing historically marginalized populations to be disproportionately exposed to environmental carcinogens.
Dr. René Javier Sotelo, a urologic oncologist at Keck Medicine of USC, notes that the fight against cancer in Southern California, amid long-standing disparities facing vulnerable communities, is very much about overcoming educational, cultural and socioeconomic barriers.
While access to care and insurance options in Los Angeles are relatively robust, many disparities persist because community members often lack crucial information about risk factors, screening and early warning signs. “We need to insist on the importance of education and screening,” Sotelo said. He emphasized that making resources, helplines and culturally tailored materials readily available to everyone is crucial.
He cites penile cancer as a stark example: rates are higher among Latino men in L.A., not necessarily due to lack of access, but because of gaps in awareness and education around HPV vaccination and hygiene.
Despite these persisting inequities, the dramatic nationwide improvement in cancer survival is unquestionably good news, bringing renewed hope to many individuals and families. However, the report also gives a clear warning: Proposed federal cuts to cancer research and health insurance could stop or even undo these important gains.
“We can’t stop now,” warned Shane Jacobson, the American Cancer Society’s chief executive.
“We need to understand that we are not yet there,” Sotelo concurred. ”Cancer is still an issue.”
Science
Clashing with the state, L.A. City moves to adopt lenient wildfire ‘Zone Zero’ regulations
As the state continues multiyear marathon discussions on rules for what residents in wildfire hazard zones must do to make the first five feet from their houses — an area dubbed “Zone Zero” — ember-resistant, the Los Angeles City Council voted Tuesday to start creating its own version of the regulations that is more lenient than most proposals currently favored in Sacramento.
Critics of Zone Zero, who are worried about the financial burden and labor required to comply as well as the detrimental impacts to urban ecosystems, have been particularly vocal in Los Angeles. However, wildfire safety advocates worry the measures endorsed by L.A.’s City Council will do little to prevent homes from burning.
“My motion is to get advice from local experts, from the Fire Department, to actually put something in place that makes sense, that’s rooted in science,” said City Councilmember John Lee, who put forth the motion. “Sacramento, unfortunately, doesn’t consult with the largest city in the state — the largest area that deals with wildfires — and so, this is our way of sending a message.”
Tony Andersen — executive officer of the state’s Board of Forestry and Fire Protection, which is in charge of creating the regulations — has repeatedly stressed the board’s commitment to incorporating L.A.’s feedback. Over the last year, the board hosted a contentious public meeting in Pasadena, walking tours with L.A. residents and numerous virtual workshops and hearings.
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Some L.A. residents are championing a proposed fire-safety rule, referred to as “Zone Zero,” requiring the clearance of flammable material within the first five feet of homes. Others are skeptical of its value.
With the state long past its original Jan. 1, 2023, deadline to complete the regulations, several cities around the state have taken the matter into their own hands and adopted regulations ahead of the state, including Berkeley and San Diego.
“With the lack of guidance from the State Board of Forestry and Fire Protection, the City is left in a precarious position as it strives to protect residents, property, and the landscape that creates the City of Los Angeles,” the L.A. City Council motion states.
However, unlike San Diego and Berkeley, whose regulations more or less match the strictest options the state Board of Forestry is considering, Los Angeles is pushing for a more lenient approach.
The statewide regulations, once adopted, are expected to override any local versions that are significantly more lenient.
The Zone Zero regulations apply only to rural areas where the California Department of Forestry and Fire Protection responds to fires and urban areas that Cal Fire has determined have “very high” fire hazard. In L.A., that includes significant portions of Silver Lake, Echo Park, Brentwood and Pacific Palisades.
Fire experts and L.A. residents are generally fine with many of the measures within the state’s Zone Zero draft regulations, such as the requirement that there be no wooden or combustible fences or outbuildings within the first five feet of a home. Then there are some measures already required under previous wildfire regulations — such as removing dead vegetation like twigs and leaves, from the ground, roof and gutters — that are not under debate.
However, other new measures introduced by the state have generated controversy, especially in Los Angeles. The disputes have mainly centered around what to do about trees and other living vegetation, like shrubs and grass.
The state is considering two options for trees: One would require residents to trim branches within five feet of a house’s walls and roof; the other does not. Both require keeping trees well-maintained and at least 10 feet from chimneys.
On vegetation, the state is considering options for Zone Zero ranging from banning virtually all vegetation beyond small potted plants to just maintaining the regulations already on the books, which allow nearly all healthy vegetation.
Lee’s motion instructs the Los Angeles Fire Department to create regulations in line with the most lenient options that allow healthy vegetation and do not require the removal of tree limbs within five feet of a house. It is unclear whether LAFD will complete the process before the Board of Forestry considers finalized statewide regulations, which it expects to do midyear.
The motion follows a pointed report from LAFD and the city’s Community Forest Advisory Committee that argued the Board of Forestry’s draft regulations stepped beyond the intentions of the 2020 law creating Zone Zero, would undermine the city’s biodiversity goals and could result in the loss of up to 18% of the urban tree canopy in some neighborhoods.
The board has not decided which approach it will adopt statewide, but fire safety advocates worry that the lenient options championed by L.A. do little to protect vulnerable homes from wildfire.
Recent studies into fire mechanics have generally found that the intense heat from wildfire can quickly dry out these plants, making them susceptible to ignition from embers, flames and radiant heat. And anything next to a house that can burn risks taking the house with it.
Another recent study that looked at five major wildfires in California from the last decade, not including the 2025 Eaton and Palisades fires, found that 20% of homes with significant vegetation in Zone Zero survived, compared to 37% of homes that had cleared the vegetation.
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