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Fire will happen in California. It’s just a question of when and where.

Ask me one thing I love about living in Los Angeles and there’s a good chance I’d say, Because it’s wild. The giant city park near us is no flat, grassy plane for picnicking and Frisbee, but a rugged expanse of coyotes and the occasional mountain lion, God rest his soul. Outside my window loom the San Gabriel Mountains, loaded with hiking trails.
This is a place integrated with nature. People hike after brunch. But, as we must say at times like this, there is a cost to that.
The skies are dark today after two enormous wildfires sprang up overnight, sparked and fueled by ferocious Santa Anas. The winds, which blow hot air from the inland Great Basin toward the ocean, typically bring unseasonably warm days and fire danger in autumn. This January incident brought gusts as high as 100 miles per hour that rattled our windows and downed trees across town.
First came the fire in the Pacific Palisades, the area between the city’s ritzy western beach towns and the oft-burning hills of Malibu. The Palisades fire turned into a beast in a hurry as tens of thousands of people abandoned their homes and parts of Santa Monica went on high alert. Bulldozers bulldozed abandoned cars to make way for fire trucks.
Later in the evening, a second blaze began in Eaton Canyon, whose waterfall makes it one of the busiest hiking destinations in town. Eaton spread quickly in the dry mountains above Pasadena, forcing evacuations and alerts in the cities like Altadena and La Cañada Flintridge and creating a dark cloud of smoke over the San Gabriel Valley. At Caltech, where I work, the campus is wind-beaten and classes are canceled, as they are at plenty of area school districts.
L.A. woke up Wednesday morning to find itself between two fires. And those two enormous events, each of which has consumed thousands of acres by now, aren’t the end of it. Another major wildfire broke out north of the city near Santa Clarita. Smaller blazes have popped up all around town like a cruel game of Whack-a-Mole — in Pasadena, in Culver City, and close to here, by Dodger Stadium. Mercifully, most of these flare-ups were extinguished before they could spread.
In social media posts, residents are recommending to each other the excellent Watch Duty app that tracks fires as they develop. To have that on your phone this week is to be barraged by messages about new evacuation orders and new fires blazing up. With the whole region bone-dry and the gusts unrelenting, the city suddenly feels like a minefield. Any expanse of tree or scrub could be the next one to catch fire. As I watched out my window last night to see the mountain flames dance in the distance, a power line explosion in the foreground darkened part of a neighborhood across the river.
Such gloom was already a signature part of late summer and autumn in California, when the months of near-zero precipitation create a tinderbox in the hills and the mountains. Now, wildfires are seasonally unbounded. No significant rain has fallen in November or December. That, plus, an extremely hot and dry summer, led to the parched conditions that combined with freak winds to set the city ablaze during what used to be a wet month.
This is the way of things now. During the past two winters, El Niño conditions dropped heavy rainfall around Los Angeles that added snowpack to the mountains and eased drought conditions in the area. This winter we haven’t been so fortunate. In a climate-changed L.A. with less rain during its rainy season, the delicate balance of the city starts to tilt out of balance. It’s harder and harder to have neighborhoods in and up against the mountains, when wildfires seem to come so much more often.
These events inevitably trigger a wave of “How could you live in such a place?” Of course, you could ask the same thing of the tornadoes that sweep through where I’m originally from, or the hurricanes of the Gulf Coast. Every place has its disasters, and major wildfires are growing more common everywhere, not just in California. Retreat is an illusion.
What matters, here and elsewhere, is resilience. Not just the psychological kind that means we recover and come back, but the practical, logistical kind, like decentralized electrical grids that are less vulnerable to natural disasters and help people keep the lights on when the worst happens. We must build for the unexpected now that the freak cataclysm isn’t a freak event anymore.
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The data center boom is everywhere you look in U.S. economic and emissions data.
This is an edition of Heatmap Daily, an evening review of the day’s news written by our executive editor. Sign up for it here.
It isn’t exactly a new thought, but I’ve been struck recently by how many trends in America’s economic and environmental data are fundamentally about the data center boom and the return of electricity demand:
First, the Energy Information Administration reported this week that U.S. emissions grew by more than 2% last year, driven by surging electricity demand and an increase in coal-fired generation. What caused that higher power demand? New factories and data centers — as well as record summertime cooling demand.
Second, many of the new factories driving that higher power demand are themselves producing goods that are … let’s say … data center-adjacent. There are the enormous new semiconductor fabs, of course. But Ford and General Motors have also set up new production lines (or repurposed old ones) to manufacture grid-scale batteries to meet power demand.
Third, take a look at the recent U.S. spending on private non-residential construction — in other words, everything American companies are building that is not houses, condos, or apartments.
The construction industry’s spent almost $60 billion on data centers over the past year, which is more than it spent on all other office buildings combined (and more than it spent building warehouses, too). Just a handful of categories — data centers, power plants, electricity infrastructure, and certain kinds of electronics manufacturing — now make up a third of all U.S. private non-residential construction investment. They’ve never made up such a large share of construction spending since data collection began in 2014.
As The New York Times recently noted, the American economy is unusually dependent on the American stock market right now — and the stock market is unusually dependent on artificial intelligence. This week, investors started to balk at the enormous spending hyperscalers are planning to keep building out the AI boom; Alphabet’s shares dropped 8% this week after it boosted its planned 2026 capital expenditure and signaled 2027 will be even bigger. If the data center boom started to slow down in earnest, then more than just that budget will change.
Speaking of which, my colleague Emily Pontecorvo wrote earlier this week about how many businesses are struggling to even estimate their carbon emissions from artificial intelligence. The carbon accounting startup Watershed recently unveiled a new formula to help companies get a sense of their AI-related emissions.
But even that formula is still limited by the amount of data hyperscalers publish — and they don’t publish that much. Google, for instance, is the only AI company that has (laudably) provided estimates of its emissions on a per-prompt basis. Yet no company has published its per-token emissions, or how emissions sync up with particular models or regions.
So Emily asked Google: Why aren’t you — or any other model provider — disclosing this kind of data yet?
The tech company didn’t get back to us until after we’d published Emily’s story. But its response was interesting enough that I wanted to quote some of it here.
The problem is “industry consensus,” Cooper Elsworth, a Google spokesperson, told us. “There is currently very little consensus on how to comprehensively and fairly measure the serving environmental impact of generative AI (such as text generation),” he wrote. “Without standardized, ‘apples-to-apples’ frameworks, it is difficult to compare different providers accurately.”
That’s partly because energy use — and emissions data — can vary from site to site and depend on “custom-built hardware, software compilers, and advanced inference techniques.” And he claimed Google doesn’t always have the measurement hardware in place to provide such specific estimates: “Providing precise, repeatable data requires highly advanced measurement infrastructure,” he said. “For example, software-based energy monitoring tools often suffer from sampling biases. For our study, we had to step away from top-down averages and directly measure actual energy at the physical power supply unit (PSU) level across our deployed fleet. Not all providers have the telemetry or data sets required to benchmark their operations at this level of granularity.”
Read Emily’s story to understand the other reasons why estimating — or even “guesstimating” — AI-related carbon emissions is so challenging.
A conversation with Emma Uridge of the Kansas Health Institute.
This week’s conversation is with Emma Uridge, analyst with the Kansas Health Institute. Uridge spent copious hours analyzing state and local laws on data center development to best understand how policymakers are responding to the potential environmental public health impacts of large AI infrastructure, including power and water. The report, which came out this week, also goes in depth into those health impacts. I reached out to her to discuss what she sees as must-watch territory for our readers on this emerging policy arena.
Our conversation was lightly edited for clarity.
What is actually being done on policy when it comes to data centers — beyond moratoria of course?
So first I’d like to just talk about the point of moratoria. It’s helpful to talk about how these policies emerge in the first place. One area where moratoria are helpful is when a data center is proposed but the county has no approach for how they’d like to potentially regulate them. That’s temporary, most of the time. It lets local governments conduct research on the various impacts and also negotiate community benefits, ones that can mitigate any potential negative impacts — like Lancaster Pennsylvania, which instituted a community benefit agreement that maximized the potential benefits of development while mitigating what large data centers can do. That agreement looked at capping municipal water use at 20,000 gallons per day and requiring 100% clean energy. It had financial penalties for non-compliance. The company also committed $20 million to their local economic development and clean energy fund. There are ways to negotiate with developers.
We also see amendments to existing zoning. Data center proposals are increasingly popping up in rural areas, many of which are unzoned, so there’s no way a county can negotiate unless there’s a moratorium in place.
Other policy solutions include different performance standards or requiring on-site renewable energy, like what Jefferson County, Missouri, looked at. Also setback requirements, mandatory noise buffers, ending by-right zoning.
Where are local governments getting ideas for regulating data centers?
A lot of the technical information comes from developers. That can in cases be seen as a biased source of information. I wouldn’t say there’s a dedicated group providing assistance to local governments when a project is proposed — which is a similar story to wind industry development, where we have only a handful of consultants who provide technical advice. It can be really helpful to get a multi-disciplinary approach to hearing information. It can be helpful to have the utility commission, public health folks, those in academia, as well as the developer.
As of right now, especially in rural areas, local governments have a hard task of balancing pushback while getting the most accurate, evidence-based, neutral information to make decisions. That balance can be contentious.
What is the federal government doing on data center policy? How is the Trump administration approaching it?
A few things there. In the early days, the drive was for AI expansion and to be competitive with foreign adversaries. Now due to the amount of public pushback in red and blue localities and a more cautious approach.
I’m not seeing a lot of actual policy movement at this time.
I know the EPA is looking at the chemicals used in cooling data centers because when that water is cycled through the system, some of it is discharged into the water system, so they’re looking at the Toxic Substances and Control Act for monitoring that.
How much of an impact does this minimal federal role have on industry behavior?
Y’know, this isn’t specific to data centers. This is true for all kinds of large-scale development: there’s a need to require some sort of federal monitoring and regulation.
That’s where I see an emerging role for public health. At the federal level, there could be policy movement towards requiring some sort of environmental monitoring at data centers to make sure they’re operating responsibility. Looking at specific water use relative to water availability and what happens when there’s a time of severe, persistent drought. With air quality too — we’ve seen areas where the grid isn’t as reliable so their diesel generators are kicking on more and affecting air quality for residents.
We’re just not seeing all of that right now. We need corporate disclosure.
What do you see as the most important public health impacts from data center development?
It varies by localities. The most discussed obviously is water usage. One thing I’d note about my conversations with folks enthusiastic around emerging tech is, there are still questions that need to be asked about the capacity of localities to support a data center. Like a small town in Kansas may only be using 40% of their water for their utility needs. If a data center came online, how much of that water goes to the data center?
One area underexplored within the public health discipline is energy poverty and energy security. The ability of a household to meet the needs of everything energy provides in our lives. It’s known we have an aging electric grid but we’re not talking enough about large-scale blackouts when the grid is not sufficient to support some of these new data centers.
Plus more of the week’s big development fights.
1. Laramie County, Wyoming — Meta is fighting the fine it received in the Cheyenne data center water pollution controversy, and the conflict between the tech giant and the city’s small board of public utilities is continuing to spill out into the public.
2. Niagara County, New York — This county just rejected a solar project’s highway work permits in a show of retaliation against the state’s Office of Renewable Energy Siting.
3. Barron County, Wisconsin — The anti-solar protest is the new campaign stop in deep red Wisconsin.
4. Chesapeake, Virginia — A large battery storage project on the Virginia coastline is on the rocks amidst rampant local opposition.
5. Lewis County, West Virginia — West Virginia is now a key battleground in the fight over transmission, as a line spanning all of West Virginia and Maryland — and cutting through Data Center Alley in Virginia — causes compounding consternation.