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LA fires: Why fast-moving wildfires and those started by human activities are more destructive and harder to contain
Virginia Iglesias, University of Colorado Boulder
Investigators are trying to determine what caused several wind-driven wildfires that have destroyed thousands of homes across the Los Angeles area in January 2025. Given the fires’ locations, and lack of lightning at the time, it’s likely that utility infrastructure, other equipment or human activities were involved.
California’s wildfires have become increasingly destructive in recent years. Research my colleagues and I have conducted shows U.S. wildfires are up to four times larger and three times more frequent than they were in the 1980s and ’90s. Fast-moving fires have been particularly destructive, accounting for 78% of structures destroyed and 61% of suppression costs between 2001 and 2020.
Lightning strikes are a common cause of U.S. wildfires, but the majority of wildfires that threaten communities are started by human activities.
A broken power line started the deadly 2023 Maui fire that destroyed the town of Lahaina, Hawaii. Metal from cars or mowers dragging on the ground can spark fires. California’s largest fire in 2024 started when a man pushed a burning car into a ravine near Chico. The fire destroyed more than 700 homes and buildings.
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What makes these wildfires so destructive and difficult to contain?
The answer lies in a mix of wind speed, changing climate, the legacy of past land-management practices, and current human activities that are reshaping fire behavior and increasing the risk they pose.
Fire’s perfect storm
Wildfires rely on three key elements to spread: conducive weather, dry fuel and an ignition source. Each of these factors has undergone pronounced changes in recent decades. While climate change sets the stage for larger and more intense fires, humans are actively fanning the flames.
Climate and weather
Extreme temperatures play a dangerous role in wildfires. Heat dries out vegetation, making it more flammable. Under these conditions, wildfires ignite more easily, spread faster and burn with greater intensity. In the western U.S., aridity attributed to climate change has doubled the amount of forestland that has burned since 1984.
Compounding the problem is the rapid rise in nighttime temperatures, now increasing faster than daytime temperatures. Nights, which used to offer a reprieve with cooler conditions and higher humidity, do so less often, allowing fires to continue raging without pause.
Finally, winds contribute to the rapid expansion, increased intensity and erratic behavior of wildfires. Wind gusts push heat and embers ahead of the fire front and can cause it to rapidly expand. They can also create spot fires in new locations. Additionally, winds enhance combustion by supplying more oxygen, which can make the fire more unpredictable and challenging to control. Usually driven by high winds, fast-moving fires have become more frequent in recent decades.
Fuel
Fire is a natural process that has shaped ecosystems for over 420 million years. Indigenous people historically used controlled burns to manage landscapes and reduce fuel buildup. However, a century of fire suppression has allowed vast areas to accumulate dense fuels, priming them for larger and more intense wildfires.
Invasive species, such as certain grasses, have exacerbated the issue by creating continuous fuel beds that accelerate fire spread, often doubling or tripling fire activity.
Additionally, human development in fire-prone regions, especially in the wildland-urban interface, where neighborhoods intermingle with forest and grassland vegetation, has introduced new, highly flammable fuels. Buildings, vehicles and infrastructure often ignite easily and burn hotter and faster than natural vegetation. These changes have significantly altered fuel patterns, creating conditions conducive to more severe and harder-to-control wildfires.
Ignition
Lightning can ignite wildfires, but humans are responsible for an increasing share. From unattended campfires to arson or sparks from power lines, over 84% of the wildfires affecting communities are human-ignited.
Human activities have not only tripled the length of the fire season, but they also have resulted in fires that pose a higher risk to people.
Lightning-started fires often coincide with storms that carry rain or higher humidity, which slows fires’ spread. Human-started fires, however, typically ignite under more extreme conditions – hotter temperatures, lower humidity and stronger winds. This leads to greater flame heights, faster spread in the critical early days before crews can respond, and more severe ecosystem effects, such as killing more trees and degrading the soil.
Human-ignited fires often occur in or near populated areas, where flammable structures and vegetation create even more hazardous conditions. Homes and the materials around them, such as wooden fences and porches, can burn quickly and send burning embers airborne, further spreading the flames.
As urban development expands into wildlands, the probability of human-started fires and the property potentially exposed to fire increase, creating a feedback loop of escalating wildfire risk.
Whiplash weather
A phenomenon known as whiplash weather, marked by unusually wet winters and springs followed by extreme summer heat, was especially pronounced in Southern California in recent years.
A wet spring in 2024 fostered vegetation growth, which then dried out under scorching summer temperatures, turning into highly combustible fuel. This cycle fueled some of the biggest fires of the 2024 season, several of which were started by humans.
That dryness continued in Southern California through the fall and into early winter, with very little rainfall. Soil moisture in the Los Angeles region was about 2% of historical levels for that time of year when the fires began on Jan. 7, 2025.
As the factors that can drive wildfires converge, the potential for increasingly severe wildfires looms ever larger. Severe fires also release large amounts of carbon from trees, vegetation and soils into the atmosphere, increasing greenhouse gas emissions and exacerbating climate change, contributing to more extreme fire seasons.
This is an update to an article originally published Oct. 8, 2024.
Virginia Iglesias, Interim Earth Lab Director, University of Colorado Boulder
This article is republished from The Conversation under a Creative Commons license. Read the original article.
News
Entertain with Ease Using Fresh Fall Flavors
Fresh Fall Flavors: When seasonal celebrations start to fill up your calendar as you host friends and family, an appetizer that is delicious, yet simple, quickly moves from a new addition at the table to a tried-and-true shareable that guests look forward to year after year. This Baked Feta with Roasted California Grapes recipe delivers warm and rich flavors while being incredibly easy to prepare in a rush.
Entertain with Ease Using Fresh Fall Flavors
(Feature Impact) When seasonal celebrations start to fill up your calendar as you host friends and family, an appetizer that is delicious, yet simple, quickly moves from a new addition at the table to a tried-and-true shareable that guests look forward to year after year.
This Baked Feta with Roasted California Grapes recipe delivers warm and rich flavors while being incredibly easy to prepare in a rush. Juicy Grapes from California are roasted to deepen their sweet flavor then served over baked feta for a bite that is sweet, tangy and comforting.
Don’t forget: Grapes make an excellent healthy and fresh snack any time during the fall season, whether you need an after-school pick-me-up, a break between meetings or a quick on-the-go breakfast.
Fall into more flavorful recipe ideas at GrapesFromCalifornia.com.
Watch video to see how to make this recipe!
Baked Feta with Roasted California Grapes
Servings: 6
- 1 1/2 cups red and black seedless Grapes from California
- 1 tablespoon olive oil, plus additional for drizzling, divided
- 1-2 teaspoons balsamic vinegar
- 1 pound block feta
- 1-2 tablespoons fresh thyme
- 1 teaspoon dried oregano
- red pepper flakes, to taste
- crusty bread slices
- Heat oven to 400 F.
- In medium bowl, toss grapes with 1 tablespoon olive oil and balsamic vinegar to coat then place on baking tray. Roast 10-15 minutes, or until grapes just begin to soften. Remove from oven and let rest in pan 5 minutes.
- Slice block of feta into two thick slices and place in baking dish. Sprinkle with thyme, oregano and red pepper flakes, to taste, and drizzle with olive oil. Top with roasted grapes. Bake about 10 minutes, or until cheese has softened. Serve with crusty bread slices.
SOURCE:
California Table Grape Commission
For more recipe ideas, visit “FOOD & DRINK!“
(Feature Impact) Every year, approximately 200,000 service men and women transition from military life to corporate America. Finding the right civilian career is a transition, but it’s an opportunity to leverage military leadership and mission-driven talent.
Traditional hiring processes often focus on conventional resumes, but forward-thinking organizations recognize military experience as a competitive advantage in today’s workforce. The resilience, integrity and adaptability of America’s veterans and military families make them uniquely positioned to drive growth and innovation in their communities.
“Veterans bring unmatched discipline, adaptability and a results-driven mindset that directly translates to high-impact corporate careers,” said Drew Matheson, senior director at Capital One’s Commercial Bank and retired U.S. Army infantry officer. “While military experience doesn’t always fit perfectly on a traditional paper resume, employers like Capital One who know how to decode these unique leadership skills are able to unlock an incredible pipeline of proven performers.”
To help transitioning service members successfully navigate this career pivot, military community leaders at Capital One offer these five essential tips for service members entering the civilian workforce:
Start With What You’ve Already Earned
Opportunity starts with preparation. Beyond the well-known Post-9/11 GI Bill, which can cover tuition, housing and books, transitioning service members can look into vocational rehab or the SkillBridge program, which allows them to do civilian internships during the last 180 days of service. Many employers also offer internal tuition reimbursement programs. Taking the time to proactively map out these benefits ensures you aren’t leaving valuable opportunities or money on the table.
Find Employers with Veteran Support Structures
With almost half of veterans leaving their first post-military job within a year, according to research published by the Institute for Veterans and Military Families and VetAdvisor, finding the right culture and community is key to a successful transition. Look for employers with active veteran networks and dedicated mentorship.
For example, Capital One’s Salute Business Resource Group serves as a thriving internal community of more than 6,000 members, offering peer support, year-round professional development and mentorship for veterans, reservists and military spouses. Additionally, partner organizations like Hiring Our Heroes provide career workshops, fellowships and job fairs to ensure you’re employment-ready from day one.
Lean Into and Translate Your Soft Skills
Veterans bring a distinct competitive advantage to the applicant pool. You should confidently lean into the cross-functional “soft skills” learned in the line of duty such as risk management, crisis resolution and building trust under high-pressure scenarios.
The trick is translating these capabilities out of military jargon on your resume. Swap military terms like “NCOIC” for “Operations Manager” or “commanded” for “directed.” To make this easier, look for military-friendly employers that employ dedicated military recruiters who specialize in decoding military resumes to align skills with the right roles.
Prioritize Support for the Whole Family
Military service is a family commitment, and the transition out of uniform affects everyone. Military spouses often face unique career hurdles, including frequent relocations and employment gaps. When evaluating employers, look for companies that offer holistic benefits and flexible structures.
For example, Capital One, recognized by “U.S. Veterans Magazine” as a Top Veteran Employer and Top Military Spouse Employer, actively supports military spouses and families through dedicated spouse hiring initiatives and internal support mechanisms. Furthermore, look for organizations that support continued military training and active-duty leave, ensuring military associates never have to choose between their service and their careers.
Build Your Civilian Network Early
In the military, your network is built in. In the civilian world, you have to cultivate it. Long before your terminal leave begins, connect with veterans who work at companies you admire. Reach out for brief, 15-minute informational interviews to learn about their transition journeys rather than simply asking for a job. With more than 70% of civilian jobs filled through networking, according to estimates from Career Horizons, making organic connections early is a powerful tool for getting your foot in the door.
To find additional resources and learn more about how to support the hiring of veterans and military spouses, visit CapitalOneCareers.com/Military.
Photo courtesy of Shutterstock
SOURCE:
health and wellness
Zepbound Linked to Lower Healthcare Costs in Adults 55+ With Obesity, Real-World Study Suggests
A new real-world study of adults over age 55 with overweight or obesity found that sustained use of Zepbound (tirzepatide) for weight management was associated with lower healthcare costs over time compared with similar adults who were not treated. Eli Lilly and Company said the findings were driven in part by lower rates of hospital admissions and emergency department visits, and were published in Diabetes, Obesity and Metabolism.
What the study found
According to Lilly, researchers estimated healthcare cost differences over time (excluding the cost of Zepbound itself) using two established analytic methods. Across both approaches, monthly healthcare costs were lower, on average, among older adults who stayed on Zepbound.
Key estimates reported in the release include:
- At six months: costs were up to 15% lower (up to $181 per patient, per month).
- At 12 months: the estimated difference widened to as much as $607 per patient, per month, reflecting up to 38% lower costs than those not treated (estimates varied by model).
In the primary analysis, adults over 55 treated with Zepbound had lower rates of hospital admissions and emergency department visits across every follow-up period, along with numerically higher rates of routine outpatient and office visitsa pattern the company said was consistent with greater engagement in routine care.
Why Medicare is part of the conversation
Lilly said the cost findings may be relevant for older adults, including those in Medicares GLP-1 Bridge program. The company noted that beginning at six months, estimated healthcare savings nearly covered the programs monthly treatment cost of $195 per patient, per month, and by 12 months the estimated savings exceeded the reported monthly treatment cost.
Its important to note the release also emphasizes a limitation: claims data do not capture Zepbounds net price, and the study excluded the cost of Zepbound from total treatment costs. That means the reported differences reflect potential savings elsewhere in care that could offset treatment costs, not the full net cost impact.
Who was included in the analysis
The retrospective observational cohort study used Komodos Healthcare Map, a database of de-identified claims data from more than 330 million individuals enrolled in U.S. healthcare plans. The analysis included 15,843 adults over age 55 (mean age 64.5) with obesity or overweight plus at least one obesity-related complication who initiated Zepbound between November 2023 and September 2025. Each Zepbound user was matched 1:1 with a control participant who met the same eligibility criteria but did not initiate GLP-1 or GIP/GLP-1 receptor agonist medication.
What Zepbound is
Zepbound (tirzepatide) is a dual GIP and GLP-1 receptor agonist indicated for adults with obesity, or some adults with overweight who also have at least one weight-related medical problem, to lose weight and keep it off. Lilly also noted Zepbound is FDA-approved to treat adults with moderate-to-severe obstructive sleep apnea and obesity, and should be used alongside a reduced-calorie diet and increased physical activity.
Safety summary (high level)
The release includes an indications and safety summary with warnings. Among other risks, Lilly notes Zepbound carries a warning about thyroid tumors, including thyroid cancer, and may cause serious side effects such as severe stomach problems, dehydration leading to kidney problems, gallbladder problems, pancreatitis, serious allergic reactions, and low blood sugar (especially when used with certain diabetes medicines). Patients should talk with a healthcare provider about risks and whether the medication is appropriate for them.
Related Links
- Zepbound (official product site): https://zepbound.lilly.com/
- Lilly newsroom: https://www.lilly.com/news
- Journal page (publisher hub): https://dom-pubs.onlinelibrary.wiley.com/journal/14631326
- Medicare (official): https://www.medicare.gov/
- FDA MedWatch (side effect reporting): https://www.fda.gov/medwatch
Source
- PRNewswire / Eli Lilly and Company press release (Aug. 26, 2026): Zepbound linked to lower healthcare costs in adults over age 55 with obesity according to a real-world study
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