UCLA Law Faculty Weigh In on Solar Geoengineering Experiment at Harvard

How to engage the public when everyone on Earth is a stakeholder?

A high-altitude research balloon, though not SCoPEx’s. (NASA/NSF, 2009)


It’s been a surprisingly busy year for solar geoengineering research.

In late December, Congress appropriated $4 million to NOAA to study the influence of atmospheric aerosols on climate, with an eye on assessing “solar climate interventions.” In March, Australian scientists ran a trial of a cloud-seeding technology on the Great Barrier Reef that may one day be used for “marine cloud brightening.”

And then this summer, an independent Advisory Committee announced its first steps toward governance for a potential solar geoengineering field experiment out of Harvard University –representing a remarkable investment in participatory governance of controversial research.

Several UCLA Law faculty members recently submitted a comment letter on the proposal, praising the governance framework as a whole and suggesting ideas for creating a meaningful, appropriate public engagement process.

Solar geoengineering and a world of worry

Harvard’s Stratospheric Controlled Perturbation Experiment (“SCoPEx”) aims to investigate how aerosols behave in the stratosphere. The team proposes to fly a balloon to a height of about 65,000 feet, which would then spray about two kilograms of finely ground ice, calcium carbonate (a.k.a. limestone), and perhaps other materials into the surrounding air.  Instruments on the balloon would then observe the dispersion of the aerosol plume and its chemical and radiative effects. The data could help improve climate modeling and scientific understanding of solar geoengineering.

SCoPEx is generating some controversy, despite its tiny scale and negligible physical risks. Forty environmental and civil-society groups have expressed categorical opposition to SCoPEx. For these stakeholders, experiments like SCoPEx violate global norms and risk distracting political leaders from the difficult work of cutting greenhouse gas emissions.

SCoPEx is not the first field experiment on solar geoengineering. But it is the first to seriously grapple with the disruptive character of research and the long tail of potential policy, societal, and geopolitical risks. In light of these concerns, the research team and Harvard took the extraordinary step of empowering an independent Advisory Committee to advise on the experiment’s governance process.

Getting public engagement right

The Advisory Committee invited public comment on its governance proposal, and several faculty members at UCLA Law (including myself) submitted our thoughts. We praise the Advisory Committee for the thoughtful approach to governance and their requiring scientific and technical review, legal review, appropriate financial disclosures, and meaningful public engagement. These elements are necessary for effective nonstate governance of solar geoengineering research.

Our comments focus on public engagement, a challenging aspect of research governance. Public engagement is an opportunity for research teams to inform and educate people on projects that may affect them. These stakeholders in turn may share their views and potentially influence project decisions. Public engagement can build legitimacy, better align activities with democratic values, and improve project outcomes. This is why it is widely considered a cornerstone of good governance of solar geoengineering research.

We propose a two-tier structure for public engagement. First, there should be a high-level, permanent, free-standing public engagement process to explore the broad societal implications of solar geoengineering. This would include its potential effects on climate change policy, international cooperation, geopolitics, and global development, justice, and equity. The Advisory Committee could design and pilot consultation programs in the service of building this broader discourse. It could also sketch a proposal of this permanent platform, possibly including its mandate, setting, and membership. Importantly, this broader engagement process should not be the responsibility of a single research institution.

The second tier of public engagement concerns SCoPEx itself – and, by serving as a role model, possibly other solar geoengineering experiments. In light of the limited resources of most research teams, the public engagement needs of individual experiments would be more circumscribed. Public engagement should be tailored to stakeholders who might be directly affected by research activities.

Both levels of consultation and public engagement are essential, but they serve different purposes. They should be distinguished and handled separately.


We are heartened by the institutional resources dedicated to SCoPEx’s oversight: The social, political, and environmental concerns about solar geoengineering research are of utmost importance. This is a promising step toward building the governance the world needs.

As it happens, the Advisory Committee is seeking comment on an update to its governance framework. If you’re interested in commenting or just want to learn more, you can visit their website.

, , ,

Reader Comments

2 Replies to “UCLA Law Faculty Weigh In on Solar Geoengineering Experiment at Harvard”

  1. Readers should be aware that there is a more recent statement of opposition to SCoPEx that is relevant to this blog post, in that organizations from around the world have signed on to a statement describing the recent SCoPEx public comment process a ‘mockery of participation.’


    Also, there is some confusion arising from the actual letter (https://legal-planet.org/wp-content/uploads/2020/08/SCoPEx-comment-letter-31Jul2020-Submitted.pdf) described in this blog post. The letter is on UCLA Law School letterhead, but in the first paragraph of the letter it is stated that the comments are submitted in “our personal capacities.” If this letter was submitted on behalf of the law school (which is implied by the use of the letter head) why the caveat in the very first paragraph of the letter regarding “personal capacities?” Does this letter represent an official position of the UCLA law school?

    1. Hi Gary — Faculty members conventionally use university letterhead and/or note their university affiliation on written products within the scope of their expertise, as Professor Parson has done here. Note Professor Parson’s name and contact information at the top.

      Faculty members’ use of their own university letterhead doesn’t imply the letter “was submitted on behalf of the law school.” The caveat you describe (“our personal capacities”) is to ensure that there’s no confusion about that.

      As the letter says, it is not an “official position of the UCLA Law School” any more than any university faculty members’ opinions about anything within their expertise are official positions. Faculty members create written products all the time in their individual capacities, such as academic papers and less formal products within their expertise.

      I hope this helps, and thanks for reading!

Comments are closed.

About Charles

Charles R. Corbett is an Emmett Climate Engineering Fellow in Environmental Law and Policy at UCLA School of Law for 2019-2021. His research focuses on climate change and…

READ more

About Charles

Charles R. Corbett is an Emmett Climate Engineering Fellow in Environmental Law and Policy at UCLA School of Law for 2019-2021. His research focuses on climate change and…

READ more

POSTS BY Charles