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Dr. Crystal A. Kolden

@pyrogeog.bsky.social
5.9K followers 85 following 142 posts

Pyrogeographer. I study wildfire in the era of anthropogenic climate change. Former wildland firefighter. Opinions are my own. *she/her* 🔥🔥🔥

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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 26/08/2026
Sharing our new open-access paper in J. Pyrogeography on the 2024 Las Tablas Fire near Valparaiso, Chile that killed >135 people. It was the deadliest wildfire globally since the 2008-2009 Black Saturday Fires in Australia. We ask: what made it so deadly? doi.org/10.1016/j.py...
doi.org
Redirecting
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 18/05/2026
Do we need a tutorial on how flammable resins and waxes are produced in plants?
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 14/04/2026
I often note that CA seismic codes are required everywhere, even far from fault lines, and argue we should do the same for wildfire. Even though this was only a small shake here in Fresno, I felt it 175 miles away. Hazards travel and have far-reaching effects!
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 14/04/2026
Yes!! I felt it here in Fresno, too. @climate-guy.bsky.social didn't believe me for a minute.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 10/04/2026
They think that cutting down all the trees will remove the problem. I can't even wrap my head around how catastrophic this is going to be.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 09/04/2026
As a fire scientist, I am devastated for my many good friends and colleagues who will be affected by the mass closure of so many research stations and offices. Many will leave the agency. USFS has pioneered so much foundational fire science. The consequences of this will be catastrophic.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 02/04/2026
The presser was to confuse everyone and bury the announcement about dismantling the US Forest Service. "the Forest Service will begin transitioning to a state-based organizational model..." HQ in Utah. The state that sued for state control over Public Lands. www.usda.gov/about-usda/n...
usda.gov
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 12/02/2026
You're doing good work here, loved this episode. I am not ashamed to admit how obsessed I am with this show and how incredible it is.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 10/02/2026
That score should qualify him for the free!!!
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 23/01/2026
Okay, while I love the costuming, this definitely is not me.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 15/11/2025
When I was in my 20s and spent thousands of hours driving all over the country, I had ample time to listen to a LOT of music. Todd Snider was a poet of a songwriter whose lyrics and rambling stories between songs made the miles go by quickly. One of my favorites. RIP.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 15/11/2025
So sad. I never made it to a show, but his albums are regularly played in my car to this day. I think my kids started singing along with Beer Run by the time they were 3 or 4.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 02/10/2025
Email me at ckolden@ucmerced.edu
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 02/10/2025
It doesn't just *feel* like wildfires are becoming more catastrophic, they actually are. Led by @calxcunningham.bsky.social at Univ of Tasmania, this is a paper we started nearly 10 years ago, now in @science.org. Press release from @ucmerced.bsky.social here: news.ucmerced.edu/news/2025/wi...
news.ucmerced.edu
Wildfire Disasters Surged in the Past 10 Years, Study Shows | Newsroom
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 02/10/2025
Published today: our new paper showing a 44-year trend of increasing global wildfire disasters (fatalities and economic losses) due to climate change-induced extreme weather. www.science.org/doi/10.1126/...
science.org
Climate-linked escalation of societally disastrous wildfires
Climate change and land mismanagement are creating increasingly fire-prone built and natural environments. However, despite worsening fire seasons, evidence is lacking globally for trends in socially ...
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 29/07/2025
We have a 5.9kW solar system for 2,700 sq ft house in HOT 🥵 Fresno, CA. We charge a plug-in hybrid daily. Current house: $24/yr for electricity (PG&E) Old house (no solar): >$6,000/yr Our $20K system is paid for in ~3 yrs. Solar is a scientific miracle. www.motherjones.com/environment/...
motherjones.com
Trump is trying to kill solar power—here's how to fight back
Rooftop solar is a clean power miracle. Why are we killing it with red tape?
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 25/07/2025
It's 2025, and it's still climate change driving major forest loss through wildfires. With insights from @climate-guy.bsky.social and @calxcunningham.bsky.social @ucmerced.bsky.social @utas.edu.au www.nytimes.com/2025/07/21/c...
nytimes.com
Climate Change Is Making Fire Weather Worse for World’s Forests
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 25/07/2025
Most of the homes within the fire footprint burned, so it's logical that most of the homes for sale would be outside the footprint. We see this consistently across fire disasters: people sell and leave. They want to move on with their lives. We're prepping a final report on this right now for HUD.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 21/07/2025
I've been calling myself a pyrogeographer for over two decades, and now we have a journal just for us, led by the fantastic @mattwjones.bsky.social (full disclosure: I sit on the editorial board). We warmly invite you to submit to #Pyrogeography today! www.sciencedirect.com/journal/jour...
sciencedirect.com
Journal of Pyrogeography | ScienceDirect.com by Elsevier
Read the latest articles of Journal of Pyrogeography at ScienceDirect.com, Elsevier’s leading platform of peer-reviewed scholarly literature
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Reposted by Dr. Crystal A. Kolden
Marco Turco @marco-turco.bsky.social · 11/07/2025
Happy to share our new paper: we show that human-caused climate change is raising the odds of extreme climate-driven fire years across forested regions of the globe @climate-guy.bsky.social @pyrogeog.bsky.social rdcu.be/evJkX #ClimateChange #Wildfires
rdcu.be
Climate change has increased the odds of extreme regional forest fire years globally
Nature Communications - The authors show that extreme fire years in global forests align with rare fire weather extremes. Climate change has made such extremes 88-152% more probable. These findings...
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 03/07/2025
Also, if you're not following @mattwjones.bsky.social please give him a follow. He's the Editor-In-Chief of the new journal Pyrogeography!
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 02/07/2025
More amazing teamwork led by the fantastic @mattwjones.bsky.social to develop a global database of prescribed fire.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 27/06/2025
Praying to the Flying Spaghetti Monster over here...
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 12/06/2025
gwern.net/doc/history/...
gwern.net
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 06/06/2025
My theory: some DOGE minion Googled "Hatch Act" and saw the 1939 law preventing political actions by govt employees and said "Let's cut it!" Not realizing, of course, that the 1887 Hatch Act funds agricultural research at Land Grant schools that directly benefits farmers.🙄
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 29/05/2025
Spent a delightful week in Vienna last month for EGU. What a model for people (not car)-oriented living! 1) Huge car-free areas in the historic city center 2) Amazing public transit system (my 10-yr olds LOVED the subway) 3) Phenomenal bike paths Rating: 14/10 - I would live there! #waroncars
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Reposted by Dr. Crystal A. Kolden
Kylie Mohr @thatsmohrlikeit.bsky.social · 23/04/2025
feels like a good day to re-up this reporting. “Every single state in the US where we have vegetation, and particularly where we have vegetation intermixing with communities, we have the potential for extreme fire disasters,” @pyrogeog.bsky.social www.vox.com/climate/2386...
vox.com
Wildfires are coming... for New Jersey?
Climate change is expanding the list of areas at risk for the worst wildfires.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 18/04/2025
Thanks for taking pictures, Asmeret
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 16/04/2025
TOMORROW! There's still time to register: 1pm - Introductions and talk by John Mills of @watchduty.org 2pm - A look ahead at the 2025 Fire Season in CA with @climate-guy.bsky.social 2:15pm - Mitigating smoke with Dr. Sandie Ha 2:30pm - Q&A with all speakers MEDIA is welcome. Please join us!
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 11/04/2025
Climate change continued to have unpredictable impacts on wildfire in 2024. Unexpected shifts, like the Americas producing 40% of C emissions (normally it's <25%), and anomalous events, like the fatal Feb '24 Chile fire or the Pantanal wetlands burning, occur more often.
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Reposted by Dr. Crystal A. Kolden
Nature Reviews Earth & Environment @natrevearthenviron.nature.com · 11/04/2025
Kolden et al. document 2024 wildfires, finding: - 367 Mha burned - Burned area decreased 5.4% from 2023 - Fires released an estimate 1965 Tg C www.nature.com/articles/s43... (rdcu.be/ehnTP) @pyrogeog.bsky.social @climate-guy.bsky.social @mattwjones.bsky.social @ueaenv.bsky.social [6/n]
nature.com
Wildfires in 2024 - Nature Reviews Earth & Environment
Wildfire burned area was 367 Mha in 2024, ranked 17th since 2001. An estimated 1,965 Tg C was released from these fires, 41% of which came from the Americas, far exceeding their usual 25% contribution...
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 09/04/2025
On 4/17 @ucmerced.bsky.social Fire Resilience Center will host John Mills, CEO and co-founder of @watchduty.org AND have discussion with @climate-guy.bsky.social and Dr. Sandie Ha on: 1) The upcoming fire season in CA 2) How you can prepare, esp. for smoke We're streaming it online - join us!
Flyer header that shows a photo of John Mills and states the date and time as April 17, 2025 from 1-3 pm for the 2025 Wildfire outlook.QR code to register for the zoom seminar and get full schedule.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 27/03/2025
This is your regular reminder that ALL buildings in California must build to seismic codes, but only those in CALFIRE's designated high hazard areas must build to WUI fire codes. Why the discrepancy? Who the hell knows...but it means the cycle of rebuild and burn again will continue.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 19/02/2025
Ed Abbey words to live by: “A patriot must always be ready to defend his country against his government.” “Anarchism is founded on the observation that since few men are wise enough to rule themselves, even fewer are wise enough to rule others.” “Anarchism is democracy taken seriously.”
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 19/02/2025
Worried about wildfires this year? You should be. Preparedness is the absolutely most effective way to mitigate disasters, and the firing of thousands of employees and hiring freeze means that there is almost no one to prepare. WHEN wildfires start (not if), suppression will be a mess.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 10/02/2025
"Training is preparation for the known; education is preparation for the unknown." Just remember that we train AI, but we educate humans.
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Reposted by Dr. Crystal A. Kolden
Daniel Swain @weatherwest.bsky.social · 07/02/2025
Out today in @globalchangebio.bsky.social is our (brief!) rapid-response piece on the broader context surrounding the January 2025 Southern California wildfires & relevance of wet-to-dry hydroclimate whiplash to fire both locally and globally on a warming Earth. [1/8] onlinelibrary.wiley....
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 31/01/2025
Ironically called ICYMI
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 31/01/2025
There is a huge need for basic social support: driver (many people lose cars/transit), personal shopper, tech support (online forms for older people), babysitter (so parents can work/deal with crises), etc. Slightly more training: Disaster Case Manager (an advocate for survivors).
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Reposted by Dr. Crystal A. Kolden
Michael Wara @michaelwara.bsky.social · 27/01/2025
Wanted to reshare the webinar event associated with this white paper release. You can watch the event here: www.youtube.com/watch?v=QkAP... All of the messages discussed by me and the panelists require greater focus after what we have just experienced.
youtube.com
A New Strategy for Addressing the Wildfire Epidemic in California | Webinar
YouTube video by Stanford Woods Institute for the Environment
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 26/01/2025
🔥 Fire peeps... @wildland-zko.bsky.social joined us. Give him a follow.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 26/01/2025
I am shocked* that the Trillion Trees guy ends up being a problem dude. They won't comment, but anyone with that kind of funding record doesn't get let go without doing something VERY, VERY BAD. *Note: I am not shocked at all
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 25/01/2025
Hansen (2012) does the hard math looking at many variables, but here's the basic summary: an intense brushfire with average 8ft flames requires ~264,000 gallons/acre to extinguish. The top flow from a fire hydrant is 1,500 g/m. This is why we cut line. www.publish.csiro.au/wf/WF11022
publish.csiro.au
Estimating the amount of water required to extinguish wildfires under different conditions and in various fuel types
In wildland fires where water is used as the primary extinguishing agent, one of the issues of wildfire suppression is estimating how much water is required to extinguish a certain section of the fire...
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Reposted by Dr. Crystal A. Kolden
CAL FIRE @calfire.bsky.social · 17/01/2025
Access damage info directly from the incident pages: #PalisadesFire details | www.fire.ca.gov/incidents/20... #EatonFire details | www.fire.ca.gov/incidents/20... We’re here to support you on the road to recovery. Stay safe and informed!
fire.ca.gov
Palisades Fire | CAL FIRE
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 16/01/2025
You're too kind, Liz! Right back atcha.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 16/01/2025
Fire size is still important, particularly related to ecological impacts. But it's a terrible metric of accomplishments for fire agencies. We don't want to reduce acres burned, we want to reduce negative outcomes, and that's a very important difference.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 16/01/2025
Neither the Palisades nor the Eaton Fire is in the top 300 largest fires in CA historically. But their outsized catastrophic impacts demonstrate the importance of focusing on something other than area burned, which not only rules reporting, it still rules much of fire science & fire agency targets.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 16/01/2025
These fires have also scarred some of the most unstable geomorphology in the US. When the rains do come, they can create landslides and mudflows like the one that killed 23 people and damaged 500 homes in Montecito after the 2017 Thomas Fire. This secondary hazard requires preparation now.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 16/01/2025
The effects of toxic smoke will play out for millions of Angelenos in the coming years. Research on wildfire smoke estimates that it causes tens of thousands of premature deaths, >4 orders of magnitude beyond the initial losses. www.science.org/doi/10.1126/...
science.org
Mortality attributable to PM2.5 from wildland fires in California from 2008 to 2018
More than 50,000 deaths from 2008 to 2018 in California were attributable to fine particulate matter from wildland fires.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 16/01/2025
Infrastructure losses are also substantial. Schools, churches, stores, health services, utilities and more provide critical community services that cannot be easily replaced. The ripple effect of losing these services is secondary negative impacts for tens of thousands.
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