You’re out of free articles.
Log in
To continue reading, log in to your account.
Create a Free Account
To unlock more free articles, please create a free account.
Sign In or Create an Account.
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
Welcome to Heatmap
Thank you for registering with Heatmap. Climate change is one of the greatest challenges of our lives, a force reshaping our economy, our politics, and our culture. We hope to be your trusted, friendly, and insightful guide to that transformation. Please enjoy your free articles. You can check your profile here .
subscribe to get Unlimited access
Offer for a Heatmap News Unlimited Access subscription; please note that your subscription will renew automatically unless you cancel prior to renewal. Cancellation takes effect at the end of your current billing period. We will let you know in advance of any price changes. Taxes may apply. Offer terms are subject to change.
Subscribe to get unlimited Access
Hey, you are out of free articles but you are only a few clicks away from full access. Subscribe below and take advantage of our introductory offer.
subscribe to get Unlimited access
Offer for a Heatmap News Unlimited Access subscription; please note that your subscription will renew automatically unless you cancel prior to renewal. Cancellation takes effect at the end of your current billing period. We will let you know in advance of any price changes. Taxes may apply. Offer terms are subject to change.
Create Your Account
Please Enter Your Password
Forgot your password?
Please enter the email address you use for your account so we can send you a link to reset your password:
This week's hottest real estate listings were all about over-the-top sports fandom and over-the-top climate risks.

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 houses in the news this week that are notable for over the top sports amenities. The properties feature soccer fields, golf courses, pickleball courts, and so many basketball courts.
Read on to see if the properties of this competitive set are habitable.

The 7-acre Spring Ivy Estate in Old Westbury, New York, is on the market for $50 million. It’s not a house, it’s a resort. Amenity rich, the house is 25,000 square feet with grand luxurious rooms. There are soaring ceilings, a formal dining room, seven bedrooms, 13 bathrooms and an indoor-outdoor kitchen. It may not seem worth the price tag until you reach the lower level entertainment ‘complex.

There’s a game room, gym, indoor pool, billiards room, a bowling alley, 12-seat movie ‘complex’ with a real sports bar — including three screens over the bar. But what makes it worth the ticket price is the professional NBA-grade basketball court and an indoor golf simulator. The property scores well for climate risk, so let the games begin.
Featured in Mansion Global and listed for $50 million.

The co-owner of the Boston Celtics listed his suburban estate in Weston, Massachusetts, for sale as he downsizes. On 4 acres, it’s 15,000 square feet with seven beds, seven bathes, not one, but 2 basketball courts (one indoor, one outdoor), along with a spa, gym, courts, and a pool. For ultra wealthy, climate-concerned, basketball-crazed buyers, it’s a slam dunk: The house has no risk for flood, barely a risk for drought or fire, and moderate heat risk. There will be years to practice foul shots all day long, year round, in any weather.
Featured in WSJ for just under $9 million.

Super Bowl-winning quarterback Patrick Mahomes has put his Kansas City, Missouri, home on the market for $2,900,000. It’s a small house in a chic neighborhood (near the country club!), but it doesn’t lack amenities. The house has a closet that fits Mahomes’ entire collection of 180 pairs of Adidas sneakers, plus a putting green in the backyard. Habitable checked: The climate forecast, while HOT, is also a winner.
Featured in The Kansas City Star and listed for $2.9 million.

This seven-bedroom, eight-bath stone house in Nashville, Tennessee, has all the amenities of a luxury hotel: two pools, a spa, and a full gym that you won’t have to share with other guests. Perfect for a multi-sport family, there’s lots to do here — gardening, cooking at the indoor-outdoor kitchen, swimming laps, and working out at the gym along with playing tennis, pickleball, volleyball, or basketball on the multi-sport court. The only drawback is the boiling heat — hopefully any exercise-loving buyer likes to sweat.
Featured in Mansion Global and listed for just under $10 million.

He’s not Liberace, but Rod Stewart's house decor will make you wonder. For $70 million, his just-listed, 28,000-square-feet Beverly Hills mansion offers a professional soccer field with two full-size gyms and the most luxurious workout yet.

But hydration will be a problem with extreme flood and fire risk forecasted for the property. Run. Run. Run. Fast.
Featured in The Real Deal and listed for $70 million.

This sprawling house in Rancho Mirage in the desert of Coachella Valley looks lush as you drive up the long, gated drive lined with old-growth carob trees. Amenities and activities abound here. Where to start the workout? Try the gym housed in a former stable, then jump in the 80-foot pool before sweaty games on the tennis court, basketball court, putting green, and bocce ball and competitive horseshoe court. Only then are you allowed to check out the hammock. The punishing schedule is no more punishing than the climate here. A full menu of possibilities await but habitability is not one of them. There’s extreme risk of drought, and medium risk for heat, floods, and fires. Yikes.
Featured in Dwell and listed for $4 million.

Outside of Salt Lake City Utah, this 50,738-square-foot home is one of the largest homes in the United States (it’s apparently as big as the White House). The theater here has 27 seats! There are 20-foot ceilings and two staircases out front. There are hundreds if not thousands of chandeliers. Sculptures, ornamental window hangings, bathtubs for two! It’s all here for you.
And then some. The pool is not just a pool! It’s a water slide, with a lazy river and rope swings. There is a basketball court, a two-lane bowling alley, a 27-seat theater room, an exercise room, a game room. There is a pirate ship and slide in the children’s play room. And that is just inside.

Outside are trails for hiking, biking, camping, hunting, horseback riding, ATV riding, snowmobiling, and cross-country skiing.
Jam packed, but habitable? Sadly, no, because this $17 million house, the pool, the chandeliers, all of it are at extremely high risk of being eventually lost to floods, fire, heat, and drought. Enjoy it while you can.
Featured at Mansion Global and listed for $17 million.
Log in
To continue reading, log in to your account.
Create a Free Account
To unlock more free articles, please create a free account.
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.”