Dear Robert--If by "uniformity' you mean the same change in temperature everywhere, it's important to note that CO2 and GHGs do not cause a uniform change. For example, warming is higher then the global average over mid-latitude continents and especially in high latitudes (for several reasons), and the warming is lower in low latitudes (as more energy goes into evaporation) and over the oceans. Precipitation changes are also not the same everywhere. What one might say is one wants uniformity in the tendency (percentage?) moving back toward preindustrial.

Then, of course, some of the intervention approaches seem plausible as ways to offset some of the worst impacts--so MCB is getting to used to see if it can cool the waters covering the Great Barrier Reef and high reflectivity materials are being used to offset extreme urban warming. So, there seem likely to be a whole category of local to regional interventions where one might want to say they should be uniformly available based on local preference, or something similar.

So, just noting that I don't think not meeting global uniformity is really a valid requirement without a good bit of nuance.

Mike MacCracken


On 11/7/25 2:33 PM, Robert “SputnikWranglerVtoroi” Kennedy wrote:
It'll be interesting when the MAGA base gets hold of this, since the chemtrails conspiracy theorists are so embedded in that.

I've been saying this for 24 years, but I'll say it again - any intervention which does not achieve as much uniformity of effect on a planetary scale as humanly possible is doomed to fail geopolitically.  It would be difficult to distinguish interventions at continental or sub-continental scale from acts of clandestine or asymmetric war. Reversibility is another necessary characteristic of any intervention - you have to be able to turn it off if things aren't going according to plan.  Interventions based on atmospheric aerosols fail that litmus test too.

Robert Kennedy (K3TVO)
president
Tennessee Valley Stellar Corporation (www.stellarcorp.tv)
On Thursday, November 6, 2025 at 1:12:28 PM UTC-5 Geoengineering News wrote:

    Geoengineering startup has been secretly lobbying Congress for months

    
https://subscriber.politicopro.com/article/eenews/2025/11/05/geoengineering-startup-hires-powerhouse-lobbying-firm-00635123

    Stardust Solutions hired Holland & Knight, but the lobbying giant
    says it "inadvertently" failed to publicly disclose its work for
    the startup, as required by law.

    *By Corbin Hiar, Karl Mathiesen*
    *
    *
    *05 November 2025*

    CLIMATEWIRE | An American-Israeli geoengineering startup seeking
    U.S. government contracts to cool the planet has quietly begun
    lobbying on Capitol Hill.

    Stardust Solutions hired the the law firm Holland & Knight in the
    first quarter of 2025, but the firm didn't disclose its lobbying
    "due to a clerical error," Holland & Knight spokesperson Olivia
    Hoch said. Stardust's lobbying efforts have not been previously
    reported.

    Hoch declined to say how much Stardust had paid the firm or the
    specific issues it had lobbied on. That information would be
    disclosed in "the required forms in the coming days," she said in
    an email.

    Stardust is developing an integrated system to produce reflective
    particles, distribute them in the stratosphere and monitor their
    effectiveness. The startup and its investors are hoping the U.S.
    or a coalition of other governments will eventually decide to pay
    for the use of its technology.

    *Source: Politico Pro*

    On Fri, Oct 24, 2025, 7:28 PM Geoengineering News
    <[email protected]> wrote:

        https://heatmap.news/climate-tech/stardust-geoengineering

        U.S. firm led by former Israeli government physicists,
        Stardust seeks to patent its proprietary sunlight-scattering
        particle — but it won’t deploy its technology until global
        governments authorize such a move, its CEO says.

        *Robinson Meyer*

        *October 24, 2025*

        The era of the geoengineering startup has seemingly arrived.

        Stardust Solutions, a company led by a team of Israeli
        physicists, announced on Friday that it has raised $60 million
        in venture capital to develop technological building blocks
        that it says will make solar geoengineering possible by the
        beginning of next decade.

        It is betting that it can be the first to develop solar
        geoengineering technology, a hypothetical approach that uses
        aerosols to reflect sunlight away from Earth’s surface to
        balance out the effects of greenhouse gases. Yanai Yedvab,
        Stardust’s CEO, says that the company’s technology will be
        ready to deploy by the end of the decade.

        The funding announcement represents a coming out of sorts for
        Stardust, which has been one of the biggest open secrets in
        the small world of solar geoengineering researchers. The
        company is — depending on how you look at it — either setting
        out a new way to research solar radiation management, or SRM,
        or violating a set of informal global norms that have built up
        to govern climate-intervention research over time.

        Chief among these: While universities, nonprofits, and
        government labs have traditionally led SRM studies, Stardust
        is a for-profit company. It is seeking a patent for aspects of
        its geoengineering system, including protections for the
        reflective particles that it hopes governments will eventually
        disperse in the atmosphere.

        The company has sought the advice of former United Nations
        diplomats, federal scientists, and Silicon Valley investors in
        its pursuit of geoengineering technology. Lowercarbon Capital,
        one of the most respected climate tech venture capital firms,
        led the funding round. Stardust previously raised a seed round
        of $15 million from Canadian and Israeli investors. It has not
        disclosed a valuation.

        Yedvab assured me that once Stardust’s geoengineering system
        is ready to deploy, governments will decide whether and when
        to do so.

        But even if it is successful, Stardust’s technology will not
        remove climate risk entirely. “There will still be extreme
        weather events. We’re not preventing them altogether,” Yedvab
        said. Rather, tinkering with the Earth’s atmosphere on a
        planetary scale could help preserve something like normal life
        — “like the life that all of us, you, us, our children have
        been experiencing over the last few decades.” The new round of
        funding, he says, will put that dream within reach.


        Yedvab, 54, has salt and pepper hair and a weary demeanor.
        When I met him earlier this month, he and his cofounder,
        Stardust Chief Product Officer Amyad Spector, had just flown
        into New York from Tel Aviv, before continuing on to
        Washington, D.C., that afternoon. Yedvab worked for many years
        at the center of the Israeli scientific and defense
        establishment. From 2011 to 2015, he was the deputy chief
        research scientist at the Israeli Atomic Energy Commission. He
        was also previously the head of the physics division at the
        highly classified Israeli nuclear research site in Negev,
        according to his LinkedIn.

        Spector, 42, has also spent much of his career working for the
        Israeli government. He was a physics researcher at the Negev
        Nuclear Research Center before working on unspecified R&D
        projects for the government for nearly a decade, as well as on
        its Covid response. He left the government in December 2022.

        Stardust’s story, in their telling, began in the wake of the
        pandemic, when they and their third cofounder — Eli Waxman, a
        particle physics professor at the Weizmann Institute of
        Science — became curious about climate change. “We started
        [with a] first principles approach,” Yedvab told me. What were
        countries’ plans to deal with warming? What did the data say?
        It was a heady moment in global climate politics: The United
        States and Europe had recently passed major climate spending
        laws, and clean energy companies were finally competing on
        cost with oil and gas companies.

        Yet Yedvab was struck by how far away the world seemed to be
        from meeting any serious climate goal. “I think the thing that
        became very clear early on is that we’re definitely not
        winning here, right?” he told me. “These extreme weather
        events essentially destroy communities, drain ecosystems, and
        also may have major implications in terms of national
        security,” he said. “To continue doing what we’re doing over
        the next few decades and expecting materially different
        results will not get us where we want to be. And the
        implications can be quite horrific.”

        Then they came across two documents that changed their
        thinking. The first was _a 2021 report_
        
<https://www.nationalacademies.org/news/2021/03/new-report-says-u-s-should-cautiously-pursue-solar-geoengineering-research-to-better-understand-options-for-responding-to-climate-change-risks>
 from
        the National Academies of Sciences in the United States, which
        argued that the federal government should establish “a
        transdisciplinary, solar geoengineering research program” —
        although it added that this must only be a “minor part” of the
        country’s overall climate studies and could not substitute for
        emissions reductions. Its authors seemed to treat solar
        geoengineering as a technology that could be developed in the
        near term, akin to artificial intelligence or self-driving cars.

        They also found a much older article by the physicist Edward
        Teller — the same Teller who had battled with J. Robert
        Oppenheimer during the Manhattan Project. Teller _had warned_
        
<https://www.theguardian.com/environment/climate-consensus-97-per-cent/2018/jan/01/on-its-hundredth-birthday-in-1959-edward-teller-warned-the-oil-industry-about-global-warming>
 the
        oil industry about climate change as early as 1959, but in his
        final years he sought ways to avoid cutting fossil fuels at
        all. Writing in //The Wall Street Journal// weeks before the
        Kyoto Protocol meetings in 1997, an 89-year-old Teller
        _argued_
        
<https://www.wsj.com/articles/SB877028953900981000?gaa_at=eafs&gaa_n=AWEtsqfcQr-BlKCubdGxAFI0xmyf2zZwBzByWqUknRfa5EJaXLpKxNti2HcaYzs1qtE%3D&gaa_ts=68f7ea0c&gaa_sig=N2R5UsjoMl3XQM-sCgcFC1Hw8XcWIqhjTMSB5tLza3ty-l-xrPWLpJXcEfzh5JEfy2H5KgbJzBIgS3Oie5PV1Q%3D%3D>
 that
        “contemporary technology offers considerably more realistic
        options for addressing any global warming effect” than
        politicians or activists were considering.

        “One particularly attractive approach,” he wrote, was solar
        geoengineering. Blocking just 1% of sunlight could reduce
        temperatures while costing $100 million to $1 billion a year,
        he said, a fraction of the estimated societal cost of paring
        fossil fuels to their 1990 levels. A few years later, he wrote
        _a longer report_
        <https://www.osti.gov/servlets/purl/15005941> for the Energy
        Department arguing for the “active technical management” of
        the atmosphere rather than “administrative management” of
        fossil fuel consumption. He died in 2003.

        The documents captivated the two scientists. What began to
        appeal to Yedvab and Spector was the economy of scale unlocked
        by the stratosphere — the way that just a few million tons of
        material could change the global climate. “It's very easy to
        understand why, if this works, the benefit could be enormous,”
        Yedvab said. “You can actually stop global warming. You can
        cool the planet and avoid a large part of the suffering. But
        then again, it was a very theoretical concept.” They
        incorporated Stardust in early 2023.

        Economists had long anticipated the appeal of such an approach
        to climate management. Nearly two decades ago, the Columbia
        economist Scott Barrett _observed_
        <https://link.springer.com/article/10.1007/s10640-007-9174-8> that
        solar geoengineering’s economics are almost the exact opposite
        of climate change’s: While global warming is a “free rider”
        problem, where countries must collaborate to avoid burning
        cheap fossil fuels, solar geoengineering is a “free driver”
        problem, where one country could theoretically do it alone.
        Solar geonengineering’s risks lay in how /easy /it would be to
        do — and how hard it would be to govern.

        Experts knew how you would do it, too: You would use _sulfate
        aerosols_
        <https://earthobservatory.nasa.gov/glossary/sulfate%20aerosol> —
        the tiny airborne chemicals formed when sulfur from volcanoes
        or fossil fuels reacts with water vapor, oxygen, and other
        substances in the air. In a now classic natural experiment
        Teller cited in his /Journal/ op-ed, when Mount Pintabuo
        erupted in 1991 in the Philippines, it hurled _a 20 million
        ton sulfur-dioxide cloud_
        <https://www.usgs.gov/programs/VHP/volcanoes-can-affect-climate> into
        the stratosphere, cooling the world by up to 1.3 degrees
        Fahrenheit before the sulfates rained out.

        But to Yedvab, “sulfates look like a poor option,” he told me.
        Sulfates and sulfur oxides are nasty pollutants in their own
        right — they can cause asthma attacks, form acid rain, and
        _may damage_
        
<https://news.ucar.edu/942/stratospheric-injections-counter-global-warming-could-damage-ozone-layer>
 the
        ozone layer when in the stratosphere. For this reason, the
        International Maritime Organization _adopted new rules_
        
<https://www.imo.org/en/mediacentre/pressbriefings/pages/02-imo-2020.aspx> 
restricting
        the amount of sulfur in cargo shipping fuels; these rules — in
        yet another natural experiment — seem to have _accidentally
        accelerated_
        <https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2024EF005011> 
global
        warming since 2020.


        Yedvab and Spector anticipated another problem with sulfates:
        The atmosphere already contains tens of millions of tons of
        them. There is already so much sulfate in the sky from natural
        and industrial processes, they argue, that scientists would
        struggle to monitor whatever was released by geoengineers;
        Spector estimates that the smallest potential
        geoengineering/ experiment/ would require emitting 1 million
        tons of it. The chemical seemed to present an impossible
        trade-off to policymakers: How could a politician balance
        asthma attacks and acid rain against a cooler planet? “This is
        not something that decisionmakers can make a decision about,”
        Yedvab concluded.

        Yanai Yedvab and Amyad Spector in Stardust\u2019s offices in
        Rehovot, Israel

         *
             o

             o


             o



             o




             o





         *






         *







        Yedvab, left, and Spector.Courtesy of Stardust / Roby Yahav

        Instead, the three founders tried starting at the end of the
        process, as they put it. What would an //ideal
        //geoengineering system look like? “Let’s say that we are
        successful in developing a system,” Yedvab said. “What will be
        the questions that people like you — that policymakers, the
        general public — will ask us?”

        Any completed geoengineering system, they concluded, would
        need to meet a few constraints. It would need, first, a
        particle that could reflect a small amount of sunlight away
        from Earth while allowing infrared radiation from the planet’s
        surface to bounce back into space. That particle would need to
        be tested iteratively and manufactured easily in the millions
        of tons, which means it would also have to be low-cost.

        “This needs to be a scalable or realistic particle that we
        know from the start how to produce at scale in the millions of
        tons, and at the relevant target price of a few dollars per
        kilo,” Yedvab said. “So not diamonds or something that we've
        done at the lab but have no idea how to scale it up,” Yedvab said.

        It would need to be completely safe for people and the
        biosphere. Stardust hopes to run its particle through a safety
        process like the ones that the U.S. and EU subject food or
        other materials to, Yedvab said. “This needs to be as safe as,
        say, flour or some food ingredient,” Yedvab said. The particle
        would also need to be robust and inert in the stratosphere,
        and you would need some way to manage and identify it, perhaps
        even to track it, once it got there.


        Second, the system would need some way to “loft” that particle
        into the stratosphere — some machine that could disperse the
        particle at altitude. Finally, it would need some way to make
        the particles observable and controllable, to make sure they
        are acting as intended. “For visibility, for control, for, I
        would say, geopolitical implications — you want to make sure
        you actually know where, how these particles move around,
        Yedvab said.

        Stardust received $15 million in seed funding from the venture
        firm AWZ and Solar Edge, an Israeli energy company, in early
        2024. Soon after, the founders got to work.


        The world has come close to solving a global environmental
        crisis at least once before. In 1987, countries adopted the
        Montreal Protocol, which set out rules to eliminate and
        replace the chlorofluorocarbons that were destroying the
        stratospheric ozone hole. Nearly 40 years later, the ozone
        hole is _showing_
        <https://earthobservatory.nasa.gov/world-of-change/Ozone> signs
        of significant recovery. And more to the point, almost nobody
        talks about the ozone hole anymore, because someone else is
        dealing with it.

        “I would say it was the biggest triumph of environmental
        diplomacy ever,” Yedvab said. “In three years, beginning to
        end, the U.S. government was able to secure the support of
        essentially all the major powers in solving a global problem.”
        The story is not quite that simple — the Reagan administration
        initially resisted addressing the ozone hole until American
        companies like DuPont stood to benefit by selling
        non-ozone-depleting chemicals — but it captures the kind of
        triumphant U.S.-led process that Stardust wouldn’t mind seeing
        repeated.

        In 2024, soon after Stardust raised its seed round, Yedvab
        approached the Swiss-Hungarian diplomat Janos Pasztor and
        invited him to join the company to advise on the thicket of
        issues usually simplified as “governance.” These can include
        technical-seeming questions about how companies should test
        their technology and who they should seek input from, but they
        all, at their heart, get to the fundamentally undemocratic
        nature of solar geoengineering. Given that the atmosphere is a
        global public good, who on Earth has the right to decide what
        happens to it?

        Pasztor is the former UN assistant secretary-general for
        climate change, but he was also the longtime leader of the
        _Carnegie Climate Governance Initiative_ <https://c2g2.net/>,
        a nonprofit effort to hammer out consensus answers to some of
        those questions.

        Pasztor hesitated to accept the request. “It was a quadruple
        challenge,” he told me, speaking from his study in
        Switzerland. He and his wife frequently attend pro-Palestine
        demonstrations, he said, and he was reluctant to work with
        anyone from Israel as long as the country continued to occupy
        Gaza and the West Bank. Stardust’s status as a private,
        for-profit enterprise also gave him pause: Pasztor has long
        advocated for SRM research to be conducted by governments or
        academics, so that the science can happen out in the open.
        Stardust broke with all of that.

        Despite his reservations, he concluded that the issue was too
        important — and the lack of any regulation or governance in
        the space too glaring — for him to turn the company away.
        “This is an issue that does require some movement,” he said.
        “We need some governance for the research and development of
        stratospheric aerosol injection … We don’t have any.”

        He agreed to advise Stardust as a contractor, provided that he
        could publish his report on the company independently and
        donate his fee to charity. (He ultimately gave $27,000 to
        UNRWA, the UN agency for Palestinian refugees.)

        That summer, Pasztor completed his recommendations, advising
        Stardust — which remained in stealth mode — to pursue a
        strategy of “maximum transparency” and publish a website with
        a code of conduct and some way to have two-way conversations
        with stakeholders. He also encouraged the company to support a
        de facto moratorium on geoengineering deployment, and to
        eventually consider making its intellectual property available
        to the public in much the same way that Volvo _once opened its
        design_
        
<https://www.volvogroup.com/en/about-us/heritage/three-point-safety-belt.html> 
for
        the three-point seatbelt.

        His report gestured at Stardust’s strangeness: Here was a
        company that said it hoped to abide by global research norms,
        but was, by its very existence, flouting them. “It has
        generally been considered that private ownership of the means
        to manage the global atmosphere is not appropriate,” he wrote.
        “Yet the world is currently faced with a situation of //de
        facto// private finance funding [stratospheric aerosol
        injection] activities.”


        Pasztor had initially hoped to publish his report and
        Stardust’s code of conduct together, he told me. But the
        company did not immediately establish a website, and
        eventually Pasztor _simply released_
        
<https://www.linkedin.com/posts/janos-pasztor-85465421_report-to-stardust-on-governance-implications-activity-7239141519784378369-1Oms/>
 his
        report on LinkedIn. Stardust did not put up a website until
        earlier this year, during the reporting process for _a longer
        feature_
        <https://undark.org/2025/03/17/stardust-geoengineering-profitable/> 
about
        the company by the MIT-affiliated science magazine //Undark//.
        _That website_ <https://www.stardust-initiative.com/> now
        features Pasztor’s report and a set of “_principles_
        <https://www.stardust-initiative.com/our-principles>,” though
        not the code of conduct Pasztor envisioned. They are “dragging
        their feet on that,” he said.

        As news of the company trickled out, Stardust’s leaders grew
        more confident in their methods. In September 2024, Yedvab
        presented on Stardust’s approach to stratospheric researchers
        at the National Oceanic and Atmospheric Administration’s
        chemical sciences laboratory in Boulder, Colorado. The lab’s
        director, David Fahey, downplayed the importance of the talk.
        “There’s a stratospheric community in the world and we know
        all the long-term members. We’re an open shop,” he said.
        “We’ll talk to anyone who comes.” Stardust is the only company
        of its size and seriousness that has shown up, he said.

        Stardust is the only company of its size and seriousness
        working on geoengineering, period, he added. “Stardust really
        stands out for the investment that they’re trying to make into
        how you might achieve climate intervention,” he said. “They’re
        realizing there’s a number of questions the world will need
        answered if we are going to put the scale of material in the
        stratosphere that they think we may need to.” (At least one
        other U.S. company, _Make Sunsets_
        
<https://makesunsets.com/?srsltid=AfmBOoq-OxMf1QuwGMb0JBeOCnVcYBKQklClQ7EmdCiLwDHh13f2UpZj>,
        has claimed to release sulfates in the atmosphere and has even
        sold “cooling credits” to fund its work. But it has raised a
        fraction of Stardust’s capital, and its unsanctioned outdoor
        experiments set off such a backlash that Mexico _banned_
        
<https://www.reuters.com/business/environment/how-two-weather-balloons-led-mexico-ban-solar-geoengineering-2023-03-27/>
 all
        solar geoengineering experiments in response.)

        Pasztor continued to work with Stardust throughout this year
        despite the company’s foot-dragging. He left this summer when
        he felt like he was becoming a spokesperson for a business
        that he merely advised. Stardust has more recently worked with
        Matthew Waxman, a Columbia law professor, on governance issues
        through the company WestExec Advisors.

        Today, Stardust employs a roughly 25-person team that includes
        physicists, chemists, mechanical engineers, material
        engineers, and climate experts. Many of them are drawn from
        Yedvab and Spector’s previous work on Israeli R&D projects.


        The company is getting closer to its goals. Yedvab told me
        that it has developed a proprietary particle that meets its
        safety and reflectivity requirements. Stardust is now seeking
        a patent for the material, and it will not disclose the
        chemical makeup until it receives intellectual property
        protection. The company claims to be working with a handful of
        academics around the world on peer-reviewed studies about the
        particle and broader system, although it declined to provide a
        list of these researchers on the record.

        As Yedvab sees it, the system itself is the true innovation.
        Stardust has engineered every part of its approach to work in
        conjunction with every other part — a type of systems thinking
        that Yedvab and Spector presumably brought from their previous
        career in government R&D.

        Spector described one representative problem: Tiny particles
        tend to attract each other and clump together when floating in
        the air, which would decrease the amount of time they spend in
        the atmosphere, he said. Stardust has built custom machinery
        to “deagglomerate” the particles, and it has made sure that
        this dispersion technology is small and light enough to sit on
        an aircraft flying at or near the stratosphere. (The
        stratosphere begins at about 26,000 feet over the poles, but
        52,000 feet above the equator.)

        This integrated approach is part of why Stardust believes it
        is much further along than any other research effort.
        “Whatever group that would try to do this, you would need all
        those types of [people] working together, because otherwise
        you might have the best chemist, or make the best particle,
        but it would not fly,” Spector said.

        With the new funding, the company believes that its technology
        could be ready to deploy as soon as the end of this decade. By
        then, the company hopes to have a particle fabrication
        facility, a mid-size fleet of aircraft (perhaps a fraction of
        the size of FedEx’s), and an array of monitoring technology
        and software ready to deploy.

        Even then, its needs would be modest. That infrastructure —
        and roughly 2 million tons of the unspecified particle — would
        be all that was required to stop the climate from warming
        further, Spector said. Each additional million tons a year
        would reduce Earth’s temperature about half of a degree.

        Yet having the technology does not mean that Stardust will
        deploy it, Yedvab said. The company maintains that it won’t
        move forward until governments invite it to. “We will only
        participate in deployment which will be done under adequate
        governance led by governments,” Yedvab told me. “When you're
        dealing with such an issue, you should have very clear guiding
        principles … There are certain ground rules that — I would say
        in the lack of regulation and governance — we impose upon
        ourselves.”


        He said the company has spoken to American policy makers “on
        both sides of the aisle” to encourage near-term regulation of
        the technology. “Policymakers and regulators should get into
        this game now, because in our view, it's only a matter of time
        until someone will say, //Okay, I'm going and trying to do
        it//,” Yedvab said. “And this could be very dangerous.”

        There is a small and active community of academics,
        scientists, and experts who have been thinking and studying
        geoengineering for a long time. Stardust is not what almost
        any of them would have wished a solar geoengineering company
        to look like.

        Researchers had assumed that the first workable SRM system
        would come from a government, emerging at the end of a long
        and deliberative public research process. Stardust, meanwhile,
        is a for-profit company run by Israeli ex-nuclear physicists
        that spent years in stealth mode, is seeking patent
        protections for its proprietary particle, and eventually hopes
        — with the help of the world’s governments — to disperse that
        particle through the atmosphere indefinitely.

        For these reasons, even experts who in other contexts support
        aggressive research into deploying SRM are quite critical of
        Stardust.

        “The people involved seem like really serious, thoughtful
        people,” David Keith, a professor and the founding faculty
        director of the Climate Systems Engineering Initiative at the
        University of Chicago, told me. “I think their claims about
        making an inert particle — and their implicit assumption that
        you can make a particle that is better than sulfates” are
        “almost certain to be wrong.”

        Keith, who is on the scientific advisory board of _Reflective_
        <https://reflective.org/about/>, a San Francisco-based
        nonprofit that aims to accelerate SRM research and technology
        development, has frank doubts about Stardust’s scientific
        rationale. Sulfates are almost certainly a better choice than
        whatever Stardust has cooked up, he said, because we have
        already spent decades studying how sulfates act. “There’s no
        such particle that’s inert in the stratosphere,” he told me.
        “Now maybe they’ve invented something they’ll get a Nobel
        Prize for that violates that — but I don’t think so.”

        He also rejects the premise that for-profit companies should
        work on SRM. Keith, to be clear, does not hate capitalism: In
        2009, he founded the company Carbon Engineering, which
        developed carbon capture technology before the oil giant
        Occidental Petroleum bought it for $1.1 billion in 2023. But
        he has argued _since 2018_
        
<https://davidkeith.earth/why-i-am-proud-to-commercialize-direct-air-capture-while-i-oppose-any-commercial-work-on-solar-geoengineering/>
 that
        while carbon capture is properly the domain of for-profit
        firms, solar engineering research should never be commercialized.

        “Companies always, by definition, have to sell their product,”
        he told me. “It’s just axiomatic that people tend to overstate
        the benefits and undersell the risk.” Capitalistic firms excel
        at driving down the cost of new technologies and producing
        them at scale, he said. But “for stratospheric aerosol
        injection, we don’t need it to be cheaper — it’s already
        cheap,” he continued. “We need better confidence and trust and
        better bounding of the unknown unknowns.”

        Shuchi Talati, who founded and leads the Alliance for Just
        Deliberation on Solar Geoengineering, is also skeptical. She
        still believes that countries could find a way to do solar
        geoengineering for the public good, she told me, but it will
        almost certainly not look like Stardust. The company is in
        violation of virtually every norm that has driven the field so
        far: It is not open about its research or its particle, it is
        a for-profit company, and it is pursuing intellectual property
        protections for its technology.

        “I think transparency is in every single set of SRM
        principles” developed since the technology was first
        conceived, she said. “They obviously have flouted that in
        their entirety.”

        She doubted, too, that Stardust could actually develop a new
        and totally biosafe chemical, given the amount of mass that
        would have to be released in the stratosphere to counteract
        climate change. “Nothing is biosafe” when you disperse it at
        sufficient scale, she said. “Water in certain quantities is
        not biosafe.”

        The context in which the company operates suggests some other
        concerns. Although SRM would likely make a poor weapon, at
        least on short time scales, it is a powerful and world-shaping
        technology nonetheless. In that way, it’s not so far from
        nuclear weapons. And while the world has found at least one
        way to govern //that //technology — the nonproliferation
        regime — Israel has bucked it. It is one of only four
        countries in the world to have never signed the Nuclear
        Nonproliferation Treaty. (The others are India, Pakistan, and
        South Sudan.) Three years ago, the UN voted 152 to 5 that
        Israel _must give up its weapons_
        <https://www.jpost.com/international/article-720993> and sign
        the treaty.


        These concerns are not immaterial to Stardust, given Yedvab
        and Spector’s careers working as physicists for the
        government. In our interview, Yedvab stressed the company’s
        American connections. “We are a company registered in the
        U.S., working on a global problem,” he told me. “We come from
        Israel, we cannot hide it, and we do not want to hide it.” But
        the firm itself has “no ties with the Israeli government — not
        with respect to funding, not with respect to any other aspect
        of our work,” he said. “It’s the second chapter in our life,”
        Spector said.

        Stardust may not be connected to the Israeli government, but
        some of its funders are. The venture capital firm AWZ, which
        participated in its $15 million seed round, _touts_
        <https://www.awzventures.com/about> its partnership with the
        Israeli Ministry of Defense’s directorate of defense R&D, and
        the fund’s strategic advisors include Tamir Pardo, the former
        director of the Israeli intelligence agency Mossad. “We have
        no connection to the Israeli government or defense
        establishment beyond standard regulatory or financial
        obligations applicable to any company operating in Israel,” a
        spokesperson for Stardust reiterated in a statement when I
        asked about the connection. “We are proud that AWZ, along with
        all of our investors, agrees with our mission and believes
        deeply in the need to address this crisis.”

        One of Stardust’s stated principles is that deployment should
        be done under “established governance, guided by governments
        and authorized bodies.” But its documentation provides no
        detail about who those governments might be or how many
        governments amount to a quorum.

        “The optimal case, in my view, is some kind of a multilateral
        coalition,” Yedvab said. “We definitely believe that the U.S.
        has a role there, and we expect and hope also the other
        governments will take part in building this governance structure.”

        Speaking with Pasztor, I observed that the United States and
        Israel’s actions often deviate sharply from what the rest of
        the world might want or inscribe in law. What if they decided
        to conduct geoengineering themselves? “This gets into a pretty
        hairy geopolitical discussion, but it has to be had,” Pasztor
        told me. He had discussed similar issues with the company, he
        said, adding that “at just about every meeting he had” with
        the team, Stardust’s leaders hoped to “disassociate and
        distance themselves” from the current Israeli government.
        “Even when there were suggestions in my recommendations that
        the first step is to work through ‘your government’ — their
        thinking was, //Okay, we will do it with the Americans//,” he
        said.


        He also discussed with the team the risks of the United States
        going it alone and pursuing stratospheric aerosol injection by
        itself. That would produce an enormous backlash, Pasztor
        warned, especially when the Trump administration “is doing
        everything contrary to what one should do” to fight climate
        change. “And then doing the U.S. and Israel together — given
        the current double geopolitical context — that would be even
        worse,” he said. (“Of course, they could get away with it,” he
        added. “Who can stop the U.S. from doing it?”)

        And that hints at perhaps the greatest risk of Stardust’s
        existence: that it prevents progress on climate change simply
        because it will discourage countries from cutting their fossil
        fuel use. Solar geoengineering’s biggest risk has long seemed
        to be this moral hazard — that as soon as you can dampen the
        atmospheric effects of climate change, countries will stop
        caring about greenhouse gas emissions. It’s certainly
        something you can imagine the Trump administration doing, I
        posed to Yedvab.

        Yedvab acknowledged that it is a “valid argument.” But the
        world is so off-track in meeting its goals, he said, that it
        needs to prepare a Plan B. He asked me to imagine two
        different scenarios, one where the world diligently develops
        the technology and governance needed to deploy solar
        geoengineering over the next 10 years, and another where it
        wakes up in a decade and decides to crash toward solar
        geoengineering. “Now think which scenario you prefer,” he said.

        Perhaps Stardust will not achieve its goals. Its proprietary
        particle may not work, or it could prove less effective than
        sulfates. The company claims that it will disclose its
        particle once it receives its patent — which could happen as
        soon as next year, Yedvab and Spector said — and perhaps that
        process will reveal some defect or other factor that means it
        is not truly biosafe. The UN may also try to place a blanket
        ban on geoengineering research, as some groups hope.

        Yet Stardust’s mere existence — and the “free driver” problem
        articulated by Barrett nearly two decades ago — suggests that
        it will not be the last to try to develop geoengineering
        technology. There is a great deal of interest in SRM in San
        Francisco’s technology circles; Pastzor told me that he saw
        Reflective as “not really different” from Stardust outside of
        its nonprofit status. “They’re getting all the money from
        similar types of funders,” he said. “There is stuff happening
        and we need to deal with it.”


        For those who have fretted about climate change, the continued
        development of SRM technology poses something of a “put up or
        shut up” moment. One of the ideas embedded in the concept of
        “climate change” is that humanity has touched everywhere on
        Earth, that nowhere is safe from human influence. But
        subsequent environmental science has clarified that, in fact,
        the Earth has not been free of human influence for millennia.
        Definitely not since 1492, when the flora and fauna of the
        Americas encountered those of Afro-Eurasia for the first time
        — and probably not since human hunters wiped out the Ice Age’s
        great mammal species roughly 10,000 years ago. The world has
        over and over again been remade by human hands.

        Stardust may not play the Prometheus here and bring this
        particular capability into humanity’s hands. But I have never
        been so certain that someone will try in our lifetimes. We
        find ourselves, once again, in the middle of things.


        *Source: Heatmap*

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