The Shadow Thermostat: Inside the Geopolitical War Games Preparing the World for Solar Geoengineering

Executive Overview

When climate researcher Colleen Golja walked into a meeting room at Queen Mary University of London last September, she brought with her a naive, foundational article of faith: that in matters concerning the survival of the planet, science, reason, and empirical truth would naturally command a central seat at the table. She assumed that global leaders, when confronted with existential threats, would prioritize planetary preservation and ethical consensus over parochial squabbling.

“I thought that would be such an easy thing,” Golja reflected. “Like, we can all agree to do ethical research and make sure it’s for the better of all humans. And boy, was I wrong.”

By the time the simulation concluded days later, Golja was in tears, her worldview radically upended. She had just spent the better part of a week participating in Exploring Geopolitical Tipping Points and Climate Cooling Strategies—a high-stakes geopolitical war game designed to stress-test international responses to Solar Radiation Modification (SRM). Rather than uniting to govern a technology capable of artificially cooling the planet, the room full of diplomats, military personnel, and foreign-relations experts descended into a quagmire of mutual paranoia, strategic posturing, disinformation, and realpolitik.

The simulation was not merely an academic exercise. It offered a sobering glimpse into an unfolding reality. As the planet warms at an accelerating pace and conventional mitigation efforts stall under the weight of political polarization and economic inertia, solar geoengineering has leapt from the speculative fringes of science fiction into the boardrooms of venture capitalists and the defense strategies of superpowers. Private startups are raising tens of millions of dollars to develop aerosol-dispersal systems, tech luminaries like Elon Musk are openly advocating for space-based and atmospheric intervention, and conservative think tanks are coining nationalistic terms like "weather sovereignty."

The central thesis of the London war game—and the growing consensus among international security analysts—is that the world will not wait for a robust, harmonious global consensus to govern solar geoengineering. Instead, deployment will likely be driven by a high-stakes geopolitical arms race where fear of falling behind a rival eclipses all scientific caution.

Detailed Chronology: Anatomy of a Simulation

Organized by Danielle Young, an assistant professor in international relations at Leeds University, and funded by the UK government-funded Advanced Research and Invention Agency (ARIA), the war game brought together a couple dozen experts from around the globe. Participants were seated at tables arranged in a square, representing national governments, climate NGOs, indigenous groups, and tech companies. Golja was assigned the role of technical adviser, there to ensure that participants grounded their decisions in rigorous climate science.

The setting for the exercise was a hastily convened United Nations committee charged with coordinating an international response to rapid breakthroughs in sunlight-reflecting technologies. The simulation unfolded across three simulated temporal milestones: the present, September 2027, and September 2028. With each passing phase, the organizers dialed up the tension by introducing new technological milestones and simulated climate catastrophes.

Session One: Distrust and the Derailment of Diplomacy

The tone was set immediately in the opening session. Discussions over framing rules for outdoor atmospheric experiments quickly devolved into mutual suspicion. Delegates representing the United States and China made it clear they would reject any binding international agreement that constrained research deemed vital to their "national interest"—or, more importantly, any deal that allowed their superpower rival to gain a technological edge.

"Worse than no deal at all is any deal that favors China," summarized Major Jeffrey Nielsen, a US Army officer playing the role of a US national security attaché, speaking in a private capacity.

The friction spiked when game organizers handed the Russian delegation a fabricated "intelligence report" indicating that a mysterious aircraft near the Bering Strait was linked to an active US geoengineering research program. The US team, which was indeed conducting covert research flights, immediately cried foul and accused Moscow of spreading disinformation.

Meanwhile, Washington became utterly convinced that Beijing was aggressively developing its own clandestine solar geoengineering program. Chinese delegates attempted to insert clauses into a draft treaty granting retroactive immunity for past unauthorized experiments. In an effort to secure technology-sharing arrangements, Beijing secretly approached a player representing SpaceX. In a classic maneuver of simulated espionage, the SpaceX player immediately leaked the approach to the US team. Washington responded by demanding an international investigation, leading to a cascade of finger-pointing, walkouts, and the total collapse of the talks. A Canadian representative grimly termed the outcome a "humiliating defeat."

The Middle Sessions: The Marginalization of Science

As the simulation advanced into its later stages, the organizers attempted to steer participants back toward ecological realities. Automated notifications detailing escalating climate disasters—widespread droughts, extreme heatwaves, and eventually the catastrophic collapse of a glacier on the Tibet-Nepal border that killed more than 1,450 people—flashed across screens. Golja deployed an "emulator," a real-world scientific tool mapping how SRM would shift regional weather patterns, flood zones, and agricultural yields.

Her efforts were met with deafening apathy. The political actors in the room demonstrated almost zero interest in the physical science of the climate system. When they did consult Golja, it was exclusively to extract weaponized data points—fishing for evidence to justify their own aggressive postures or to frame a rival’s proposed tests as reckless and hostile.

The Final Day: The Fossil Fuel Trap

The climax of the simulation arrived on the final day, centering on the global fallout from a detected aerosol plume—in the game’s lore, the result of a joint US-Saudi test of proprietary technology developed by Stardust Solutions. With nations scrambling to establish monitoring networks to prevent rogue deployments, a player representing an NGO called the Climate Futures Cooperative (CFC) approached Golja, offering generous funding to establish an independent satellite observation scheme.

"Great. Fabulous. Why wouldn’t I do that?" Golja thought at the time.

It was a trap. The CFC was secretly backed by the fossil fuel industry. The game organizers had baked this dynamic into the scenario, recognizing that major oil- and gas-producing nations, alongside fossil-reliant economies, have a direct financial incentive to foster a technology that could mask global warming without requiring an immediate, painful transition away from fossil fuels. Throughout the game, the CFC had worked subtly to undermine the negotiation process. When they finally targeted Golja with funding, it was a calculated strike designed to detonate her scientific credibility and permanently fracture the unified voice of empirical research in the room.

By the end of the simulation, no international treaty had been signed, no safeguards had been established, and the room was profoundly fractured. The researchers running the simulation concluded in their final report that "strategic competition and state sovereignty drove the simulations, not climate concerns."

Supporting Context & Metrics: The Science and Stakes of SRM

To understand why the London war game played out with such ruthless realism, one must examine the technology at the center of the storm. Solar Radiation Modification (SRM) encompasses a suite of speculative interventions designed to counteract global warming by reflecting a fraction of incoming sunlight back into space.

The most studied method involves stratospheric aerosol injection (SAI)—dispersing millions of tons of sulfur dioxide, calcium carbonate, or engineered reflective particles roughly 12 to 15 miles above the Earth’s surface. This process directly mimics the cooling effects of major volcanic eruptions, such as the 1991 eruption of Mount Pinatubo in the Philippines, which temporarily lowered global average temperatures by roughly 0.5 degrees Celsius (0.9 degrees Fahrenheit).

While the physical mechanism of cooling is widely accepted by atmospheric scientists, the secondary fallout is fraught with uncertainty and profound inequality. Climate models consistently predict that while SRM could lower global averages, it will disrupt regional hydrological cycles. Some regions will experience devastating droughts, while others face supercharged monsoons. Furthermore, SRM is not a cure for carbon accumulation; it does nothing to address ocean acidification. Most dangerously, it introduces the phenomenon known as "termination shock": if a geoengineering program is interrupted by war, economic collapse, or political instability, trapped greenhouse gases would unleash a catastrophic, rapid temperature spike that could devastate global ecosystems far faster than unmanaged climate change.

Historically, solar geoengineering has been treated as a radioactive topic within mainstream climate science. Researchers who dared to study its mechanics frequently faced academic ostracization, career barriers, and social stigma. However, as global emissions continue to shatter records and climate tipping points loom closer, that stigma is eroding.

The private sector has stepped into the vacuum. In the United States, startups like Stardust Solutions have secured tens of millions of dollars in venture capital to develop advanced dispersion and delivery systems. In August, Elon Musk threw his immense weight behind the concept, posting on X (formerly Twitter): "Space satellites to control temperature and massive geo-engineering will be needed or it will be game over."

Official Statements & Emerging Policy Realities

The theoretical frameworks explored in university simulation rooms are rapidly hardening into tangible government policies and diplomatic anxieties.

In March, a trio of policy papers published by conservative US think tanks urged incoming administrations to seize the initiative on solar radiation modification, framing it explicitly as a national security imperative necessary to counter Chinese technological dominance. One paper introduced a striking new piece of nationalist rhetoric: "Weather sovereignty."

Across the Atlantic, the British government has begun quietly integrating SRM into its defense planning. Earlier this year, investigative reports revealed that the UK Ministry of Defense commissioned deep-tech security consultancies to analyze the security implications of sunlight-reflecting technologies. Shortly thereafter, the British government released its first official policy paper on SRM. While the policy officially backs further scientific research while disclaiming any immediate plans for deployment, it signals that major powers are formalizing their stances.

Yanai Yedvab, CEO of Stardust Solutions, notes that corporate lobbying efforts are meeting a dramatically more receptive audience among global policymakers. "We are developing a very powerful tool," Yedvab told reporters. "When you develop this kind of powerful technology—and you have many precedents—national interests will play out. We’re not naive about it." Yedvab maintains that his company will not engage in large-scale outdoor experiments or deployment until robust global governance is established. Yet, security experts remain deeply skeptical that market forces and sovereign competition will wait for international bureaucrats to catch up.

Cynthia Scharf, a former UN advisor who participated in the London war game, warns that the window for establishing international guardrails is terrifyingly narrow. "It’s not 15 years from now; it’s in the next decade, easily," Scharf noted. She added that while a scientifically transparent, collaborative agreement between the US and China represents the ideal defense against a dangerous geoengineering arms race, current geopolitical hostility makes such cooperation difficult to envision.

Future Outlook: Personal Retrenchment in a Warming World

The friction observed in the London war game mirrors the harsh trajectory of our current climatic and political reality. While diplomats stall and superpowers eye each other with suspicion, the drivers of the climate crisis continue to intensify. High energy costs, political polarization, and economic headwinds are consistently undercutting global efforts to curb fossil fuel consumption. The catastrophic collapse of Himalayan glaciers and relentless summer heatwaves across the Northern Hemisphere underscore that the planetary margins are wearing dangerously thin.

For Colleen Golja, the simulation served as a definitive turning point. Disillusioned by the realization that global superpowers will likely subordinate scientific reason to geopolitical paranoia and industrial self-interest, she has fundamentally reevaluated her professional trajectory.

Pinned to the corkboard behind her desk is a handwritten note outlining a new vision for life in a world governed by narrow strategic self-interest rather than empirical truth. Rather than spending her career tilting at windmills in international policy forums, Golja is preparing to return to her small coastal hometown in Connecticut. There, she plans to channel her scientific expertise into helping local communities engineer seawalls and coastal erosion buffers—tangible, localized defenses against the rising tides.

"To try and make a difference where it feels like I actually have traction," she says. After witnessing firsthand how easily science can be sidelined by power and deception, pursuing global climate governance lost its appeal. "Now it feels a little bit more personal."