How two weather balloons led Mexico to ban solar geoengineering

MEXICO CITY, March 27(Reuters) – On an April day, the founder of a U.S. startup called Make Sunsets stood outside a camper van in Mexico’s Baja California and released two weather balloons containing sulfur dioxide into the air, letting them float towards the stratosphere.

Entrepreneur Luke Iseman said the sulfur dioxide in the balloons would deflect sunlight and cool the atmosphere, a controversial climate strategy known as solar geoengineering. Mexico said the launch violated its national sovereignty.

Iseman, 39, said he does not know what happened to the balloons. But the unauthorized release, which became public in January, has already had an impact: setting off a series of responses that could set the rules for future study of geoengineering, especially by private companies, in Mexico and around the world.

The Mexican government told Reuters it is now actively drafting “new regulations and standards” to prohibit solar geoengineering inside the country. Mexico also plans to rally other countries to ban the climate strategy, a senior government official told Reuters.

While the Mexican government announced its intention to ban solar geoengineering in January, its current actions and plans to discuss geoengineering bans with other countries have not been previously reported.

“Progress is being made… to prepare the new regulations and norms on geoengineering, that is, to advance an official Mexican standard that prohibits said activity in the national territory,” Mexico’s environment ministry said in a written statement to Reuters.

The backlash from Mexico arrives as growing numbers of scientists and policy makers are urging further study of solar geoengineering, recognizing that emissions cuts alone will not limit dangerous climate change and that additional innovations may be needed.


Climate policy experts said Mexico is in a position to help set the rules for future geoengineering research.

“A country like Mexico could start pulling together other countries and say: ‘Let’s work on this together and see how we can ban it together or make it happen properly together,’” said Janos Pasztor, executive director of the Carnegie Climate Governance Initiative (C2G), which advises on governance of solar geoengineering and other climate-altering technologies.

The Mexican environment ministry statement said it would explore using the Convention on Biological Diversity’s call for a moratorium on “climate-related geoengineering activities” to enforce its ban.

Agustin Avila, a senior environment ministry official, told Reuters Mexico will also try to find common ground with other countries on geoengineering at the COP global climate summit in the United Arab Emirates this year.

The Mexican government said Make Sunsets’ balloon launch highlighted the ethical problems of allowing private companies to conduct geoengineering events.

“Why is this company, located in the United States, coming to do experiments in Mexico and not in the United States?” said Avila.

Iseman told Reuters in an email he chose Mexico because “most researchers report that particles launched into the stratosphere near the tropics will create more cooling by staying up longer.” Also, he had a truck and camper in Baja and thinks the region is beautiful, he wrote.

David Keith, a professor of applied physics and public policy at Harvard University who has dedicated much of his research to solar geoengineering, called Iseman’s launch a “stunt.”

Iseman has a background in business, not science, but said he consulted with climate scientists. Other innovative startups were ridiculed in their early days, he said. “If the ‘responsible experts’ were solving the problem, we wouldn’t have to,” he said in an email.

Until Mexico’s dispute with Make Sunsets, solar geoengineering had been gaining attention from policy makers and scientists as a possible solution to climate change, and limited research funding.

The strategy, also known as Solar Radiation Management, seeks to mimic the natural cooling effects of volcanic eruptions when ash clouds reflect back enough sunlight to reduce the warming of the earth by using planes or balloons to disperse tiny particles in the stratosphere.

Last month, 60 scientists including former NASA climate scientist James Hansen signed a letter in support of further research.

The Degrees Initiative, a UK-based non-government group, awarded $900,000 for research into the impacts of solar geoengineering on weather patterns, wildlife and glaciers to scientists from Chile, India, Nigeria and other countries.

The U.N. Environment Program in late February also recommended further study of geoengineering.

Yet some scientists remain opposed to further research, arguing that large-scale interventions in the atmosphere risk triggering extreme and unpredictable weather changes, including major droughts that would severely impact agriculture and food supply.

In 2021, the Swedish government grounded a study led by Harvard’s Keith which planned to spray calcium carbonate dust into the atmosphere to deflect sunlight after indigenous Saami people accused researchers of lacking respect for “Mother Earth.”

Frances Beinecke, a veteran environmental activist and board member of the Climate Overshoot Commission, a think tank focused on developing strategies to reduce the risk of overshooting 1.5 C in warming, said the Make Sunsets episode underscores the urgency of developing a regulatory framework that would allow further study of geoengineering and set safe and equitable rules for its use.

“The Mexico example illustrated to us that it’s not only governance to consider whether or not to utilize it, but you need governance in the research phase,” she said. “People can’t just go all over the world and launch field experiments without some kind of oversight.”

Iseman said he would welcome clearer regulation but that the international community is moving “too slowly.”

Mexico has not set a date for implementing its ban, a spokeswoman for the environmental ministry said.

And it’s unclear what effect a ban might have. Keith argues a ban is unenforceable. “You can’t write legislation that says you can’t put sulfur in the stratosphere since every commercial flight does that,” he told Reuters.

Others note that a ban on geoengineering on Mexico’s territory would offer no protection from the planet-scale impact of future experiments by any of its neighbors.

“It could happen literally next door. In terms of impacts on the world, it’s the same,” Pasztor said

Meanwhile, Make Sunsets said in a Feb. 21 blog post it had performed three additional launches near Reno, Nevada.

The National Oceanic and Atmospheric Administration (NOAA) said Make Sunsets did not report the launches. “The Weather Modification Act requires that any activity performed with the intention of producing artificial changes in the composition, behavior, or dynamics of the atmosphere be reported to the NOAA Weather Program Office before the commencement of such project or activity,” NOAA told Reuters.

Iseman said he did seek clearance from the Federal Aviation Authority, but did not disclose the balloons contained sulfur dioxide. “As far as I can tell, there isn’t any rule that would require us to do so – or even anyone who it would be relevant to notify,” he said.

Reporting by Cassandra Garrison; Editing by Stephen Eisenhammer and Suzanne Goldenberg

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