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The week's celebrity real estate listings, ranked by climate risk.

Glued to real estate posts on The New York Times, The Wall Street Journal, Dwell, Spaces, The Modern House, or Architectural Digest and wondering how those gorgeous homes will hold up in the next decades? I have you covered.
Heatmap has partnered with my new climate risk platform, Habitable. Every Friday, we add a climate risk score to the real estate listings featured in the news this week and ask: Could you live here as the climate changes?
Using a model developed by a team of Berkeley data scientists at Climate Check, Habitable scores each property for heat, flood, drought, and fire risk on a scale of 1-10. One represents the lowest risk and 10 is the highest. Our rating for each hazard is based on climate change projections through 2050. (You can check your own home’s climate risk here.)
For today’s edition, I apply the Habitable Index to this week’s headline-generating real estate to find out: Is drought driving celebrities to blaze a trail out of L.A.? And can a ranch house with fire risk — even if it is Jim Carrey’s — actually sell for $26 million? Read on for the verdict on the most habitable homes in the news this week, from best to worst:

The seaside compound of NHL legend Chris Chelios, nestled in the hillside is for sale for $75m. Located in‘Paradise Cove’ Malibu feels suspect from a climate risk perspective but, Chelios scores a hat trick:: low flood, heat, and drought risks! Also zero risk for fire. Not sure this climate paradise exists anywhere else on this Malibu coastline. Chelios and his wife who are escaping to Michigan for grandkids, might want to move them all in here. Featured in The Dirt for $75 million.

The Brentwood 1951 ranch house of Jim Carrey has more than 12,000 square feet and 6 fireplaces (even in the bathrooms). The sprawling mid-century is positioned, as usual, for severe drought and medium fire risk. Featured in Dwell and now listed for $26,500,000 (down from $ 28,900,000 when originally listed 2 months ago). (And don’t lose heart Jim, Angela Lansbury’s Brentwood home just sold $500k over asking price with the same fire and drought risk.)

My favorite comedienne, Carol Burnett sold her Los Angeles condo this week. It was on the 13th floor (she was clearly not superstitious) of the Wilshire Corridor condominium near Century City. Turns out the place is surprisingly cool and dry — no heat or flood risk. And like most of L.A., Burnett’s apartment suffers from severe drought risk although slightly less fire risk than surrounding areas — only 6/10. Featured in WSJ and sold for $3,700,000.

Mad Men creator Matthew Weiner and his former wife, architect Linda Brettler’s restored Blair House, a 1924 Spanish Mediterranean-style home which hit the market this week for $15,495,000. You would be mad to think the Mediterranean Mansion can withstand the severe drought and fire risk. Featured on Mansion Global and listed for $15,495,000.

Once upon a time in Hollywood, a gorgeous actor with great taste in art, architecture, and real estate nabbed his next real estate gem. Pitt just bought Steel House, a gleaming mid-sized mid century property, designed by noted architect Neil Johnson. The house is on a tree-filled hillside in the hip Los Feliz neighborhood and has an unfortunately severe (9/10) drought risk which will only exacerbate the also-severe fire risk, I hope this story has a happy ending. Featured in Realtor.com and sold for $5.5 million.

A ‘60s house meticulously renovated by Emily Blunt and John Krasinski has just hit the market. This very quiet place, high in the Hollywood Hills, off Mulholland Drive, has soaring views over L.A. Equally soaring is the drought and fire risk. Featured in Dwell and listed for $6 million.

Jennifer Lopez dropped the price on her eight-acre estate in Bel Air with its own lake and beach. The climate forecast shows the place will stay relatively cool. Given the risk for severe drought and fire, the on-site water would be a huge selling point if not for the uptick in flood risk. Featured in WSJ and listed for $39,995,000.
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The spinoff of Lawrence Livermore National Lab has a new 10-point plan to get onto the grid by the 2030s.
One of fusion energy’s newest startups, Inertia Enterprises, is betting that the fastest route to commercial fusion runs through one of the field’s oldest ideas. The company, which raised a $450 million Series A earlier this year, plans to build a power plant based on the laser-driven fusion system pioneered at Lawrence Livermore National Laboratory’s — the only tech yet to have produced more energy from a fusion reaction than it took to initiate it. Now, Inertia has shared its commercialization roadmap exclusively with Heatmap, detailing the 10 near-term capabilities it must demonstrate before this landmark experiment can become a grid-scale power plant by the mid-2030s.
The roadmap offers a route from the national lab’s impressive but commercially impractical fusion demonstrations to an economical power plant capable of producing electricity for the grid. At its core are a set of milestones — mostly aimed at developing cheap, mass-manufacturable components — that Inertia says it must clear before those individual systems can be integrated into a working plant. This road is not necessarily linear, however, as various teams will likely be working on many of these goals simultaneously.
At least the physics of Inertia’s approach are already proven, the startup’s CEO Jeff Lawson told me, pointing to the fusion experiments at Lawrence Livermore’s National Ignition Facility as a proof-of-concept. The lab’s demonstration of net energy gain caps more than six decades and $30 billion (in 2026 dollars) of U.S. fusion research. The remaining challenges, he argued, are all engineering-related, requiring “elbow grease, hard work, and smart people” rather than breakthroughs in fusion science.
"It seems to us like a startup or a commercial company of any variety should be focused on commercializing a proven scientific result, as opposed to actually trying to demonstrate the basic science to begin with," Lawson told me. Basic science, he argues, is better left to national labs and universities, where researchers can pursue "unbounded problems" that don’t align with the expectations and timelines of venture-backed startups.
Indeed, no fusion startup has yet achieved scientific breakeven, the milestone Lawrence Livermore first hit in 2022, and has since repeated numerous times. But leading players such as Commonwealth Fusion Systems and Helion Energy maintain that it’s only a matter of time before they validate the physics behind their own reactor designs, which they claim will be highly cost-competitive.
Lawson, on the other hand, readily acknowledged that Lawrence Livermore’s tech is uneconomical in its current form. His bet is simply that the more predictable path to a commercial reactor is to drive down the cost of the lab’s validated fusion approach, known as inertial confinement. This system relies on high-powered lasers firing at a millimeter-scale pellet of fusion fuel, compressing it to extreme temperatures and pressures until the atoms fuse. Today, the National Ignition Facility makes each individual fusion target by hand, a workable solution given that it only uses about a dozen per year.
That production model, however, isn’t remotely plausible for a grid-scale power plant. Because each fusion reaction lasts just a fraction of a billionth of a second, a commercial facility must fire its lasers at a fresh target about 10 times per second to generate continuous electricity — requiring the production of hundreds of millions of targets each year.
Scaling production to roughly a million pellets per day and making them inexpensive enough for commercial operation without compromising the strength or precision required for fusion ignition is central to Inertia’s roadmap. That includes goals five, seven, eight and nine — industrializing the manufacturing of the carbon shells that hold the fusion fuel, making the thin films that hold those carbon shells both durable and cheap, scaling up and automating fusion target assembly, and speeding up how fast targets are filled with the requisite deuterium-tritium fuel.
The other central focus of the roadmap is the laser system, which will ultimately consist of 1,000 individual units operating in concert to compress and heat the fusion fuel. Key priorities include reducing the system’s cost (goal two), dramatically increasing its firing cadence (goal three), and bolstering its durability to withstand high-intensity operations (goal four). Goal six also complements these efforts, calling for the development of a control system capable of tracking moving fusion targets to precisely align each laser shot.
Goals one and 10 bookend the journey with some broader milestones. The first focuses on increasing the fusion target’s energy gain — the ratio of fusion energy produced to laser energy delivered — to more than 25 times ignition. Today, the National Ignition Facility’s best-performing laser shot has yielded a gain of just over four times what it took to start the reaction. Goal 10 then zooms out to the ultimate objective: integrating all these technologies into a commercially viable power plant that can deliver either electricity or industrial heat to end customers.
To reach that point, Inertia has embarked on an industrial engineering hiring spree, recruiting folks with experience taking complex hardware systems from prototype to mass production, “not unlike the processes that are used in the semiconductor or consumer electronics world,” Lawson explained. The company has been making progress on its component development goals since the beginning of the year, he told me, and expects to announce the successful demonstration of a few of these milestones in the coming months. Lawson ultimately expects Inertia to complete the core components of its laser and target manufacturing systems by the middle of next year.
The team will spend the next two to three years integrating these individual pieces into two fully operational subsystems, a prototype laser system and a target manufacturing line. Around 2030, the company will begin combining those subsystems into a first-of-a-kind fusion power plant, which will also serve as the proving ground for the target chamber, tritium fuel breeding system, and power conversion system that turns fusion heat into electricity. By the middle of the next decade, Inertia aims to be generating power from this first plant, setting the stage for the company to build and connect additional grid-scale commercial power plants.
There are plenty of engineering trade-offs that the company will have to solve for. Take the decision around how to size the target chamber, for example. “If you make it bigger, your walls have an easier time and survive longer, but it’s more expensive. If you make it smaller, your walls have a tougher time because they’re closer to all the heat and energy that the fusion reaction is creating, but now your power plant costs less to build.”
But to Lawson, this represents exactly the type of problem Inertia was built to solve: complex engineering issues that come to the fore once scientists have demonstrated the fundamental physics are sound. He thinks other fusion companies may someday reach this stage, as well — though he’s unwilling to hazard a guess on exactly what approach or startup is best positioned to do so.
“There have been generations of scientists who’ve made their predictions about fusion energy and gotten it wrong,” he told me. “I’m not going to pretend to be smarter than them. All I’m here to say is, just knowing that one did work, we can commercialize it.”