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Despite what some climate change apologists might have you think.

Does everything actually suck right now? Or is it just the end of January?
It can be difficult to tell. We’re officially in the thick of what Americans consider to be the worst time of year, when complaining about the weather is an acceptable salutation and feeling “blah” is the basic condition of being alive. Even setting aside seasonal affective disorder — a condition linked to limited daylight, and thus not directly affected by climate change — studies have shown that people have a lower quality diet in the winter, and body weight usually reaches its peak this time of year. Physical activity, which is also important for mental health, dips as the weather gets worse, and research has even shown that people with Alzheimer’s disease experience more severe symptoms when the planet is tilted away from the sun.
Some have taken these winter blues as an opportunity to question the basic premise that climate change is bad. “The chief benefits of global warming” include “fewer winter deaths” and lower heating bills, Matt Ridley argued in The Spectator in 2013. Former President Donald Trump even has a quasi-annual tradition of tweeting something like “Wouldn’t be bad to have a little of that good old fashioned Global Warming right now!” during cold snaps this time of year.
Winter is, in fact, warming faster than any other season in the United States, with some parts of the country on track to lose over a month of freezing days as soon as 2050. Even if you do believe — correctly — that climate change is a global catastrophe, unless you’re a skier or snowboarder, this might sound like a good thing. So, as sacrilegious as it feels to ask, could a warmer planet make us healthier in the wintertime?
When I asked Leslie Davenport, a climate psychology educator at the California Institute of Integral Studies, if she expected milder winters to impact people psychologically, she answered immediately. “Oh, one hundred percent!,” she told me. That doesn’t mean she thinks the impact will be positive. She said she has heard people “who are a little more on the climate denial end of things” make comments like “this is great, it used to be so cold and now I can go golfing,” she told me, but “I can’t honestly call that an upside.”
Far more often, Davenport said she hears from people experiencing a sense of “unsettling” as they notice winter isn’t as cold or as snowy as they remember it being. Some might even express a feeling of “solastalgia,” a neologism that describes the sense of displacement or nostalgia that arises when a place changes environmentally. “Whether it’s the loss of snow, or areas that are drier or hotter or wetter, it is like, ‘Well, this is not the town I grew up in or the place I chose to move to because it has changed so much,’” Davenport said.
While there might be an abstract appeal to the Los Angelesification of winter nationwide, it would be a mistake to count on climate change making the season “better.” Quite the opposite, actually — warmer winters could make winter much worse, especially for those living in midlatitude cities like New York, London, or Amsterdam. “I have observed, in my travels and my research and in talking to people, that it is often much easier and more pleasant to cope with winter weather that is slightly below freezing consistently than weather that is slightly above freezing consistently,” Kari Leibowitz, a health psychologist who is working on a book about winter mindsets, told me.
Cold temperatures can actually improve our lives in several ways, Leibowitz argued. For one thing, snowfall “opens up a whole bunch of winter opportunities” like sledding, snowmobiling, snowshoeing, and all those winter sports that get people out of the house. That helps combat some of the bluesiness that otherwise comes from moping around indoors when it’s too gray and rainy to do anything active. Frozen lakes offer opportunities for skating and hockey, plus “there’s also a lot of beauty and intrigue in ice — you know, icicles and frozen rainstorms,” Leibowitz went on.
Snow, meanwhile, “reflects the light, so it makes the darkness of winter feel much, much brighter,” Leibowitz said. “And most people think it’s really beautiful — it’s clean and fresh and it smells good.”
Of course, winter weather can be dangerous, too, but “places that are colder and have really frozen winters have good infrastructure for dealing with that, and houses tend to be better insulated and heated more efficiently,” Leibowitz said. Bad winter weather can also give us much-needed permission to rest.
While there are certain places further in the south, such as Atlanta, where winter might genuinely become more pleasant as the planet warms, “there are far more places where the end of winter is just going to mean places are dark and wet,” without the upsides that come with the snow and freezing temperatures, Leibowitz stressed.
Michael Varnum, the head of the Culture and Ecology Laboratory at Arizona State University and a specialist in seasonal psychology, did find one positive. “Nobody likes to feel down, or to look at their waistline and see it’s grown,” he told me. “So potentially, there could be some upsides there.”
Naturally, much of how you feel about winter will depend on the climate where you live. In general, though, “we are somewhat more insulated from the changes in temperature that come with the seasons than we were, say, 10,000 years ago or even a couple hundred years ago,” Varnum said. Feelings of climate anxiety and distress tend to be highest in Indigenous communities in or near the Arctic, where the cold weather is a part of cultural identity and inheritance. Likewise, Davenport told me, in “places where there tends to be a lot of snow” like Japan or Finland, “there’s talk about things like ‘winter grief,’” where a milder winter makes it so that “certain rituals or holidays that have been planned in the past can’t happen anymore or as consistently.”
Many Americans, too, lose a sense of themselves when winter gets milder. “It’s what a lot of us love about living here: our winters,” Erich Osterberg, a Dartmouth climate scientist, told The New Hampshire Bulletin in 2022. “It’s more than changes to the climate,” he added, “it’s changes to our livelihood and our culture.” I encountered similar comments from Minnesotans when I was looking into how an unseasonably dry winter is imperiling this year’s cross country ski season: “Spiritually, this is terrible,” Claire Wilson, the executive director of Minneapolis’ Loppet Foundation, recently told the Star Tribune.
Winter doesn’t have to be dreaded, Leibowitz said — much of one’s enjoyment of the season comes down to mindset. But it does seem to matter that winter is actually, well, wintery, too. Whether that’s a question of our evolutionary seasonal biology (winter appears to be an important trigger for the human reproductive cycle, for one thing), or a matter of our cultural practices, or something as simple as snow being more fun than rain, it’s hard to make the case that warming winters will leave us better off.
“If you want me to find the psychological upside of anything, I could maybe do it,” Leibowitz confessed. She added, though, that “a lot of people think, ‘I hate winter, I hate the cold, I would be happy if it was warmer all year round.’ But people underestimate how much there is to be lost in losing winter.”
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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.”