The Great Simplification with Nate Hagens12 Nov 2025

Will We Artificially Cool the Planet? The Science and Politics of Geoengineering with Ted Parson

Global heating continues, despite the increased use of renewable energy sources and international policies attempting otherwise. Even as emissions reduction efforts continue, our world faces more extreme weather, sea level rise, and human health impacts, all of which are projected to accelerate in the coming decades. This raises an important but controversial question: at what point might more drastic interventions, like geoengineering, become necessary in order to cool the planet?

In this episode, Nate interviews Professor Ted Parson about solar geoengineering (specifically stratospheric aerosol injection) as a potential response to severe climate risks. They explore why humanity may need to consider deliberately cooling Earth by spraying reflective particles in the upper atmosphere, how the technology would work, as well as the risks and enormous governance challenges involved. Ted emphasizes the importance of having these difficult conversations now, so that we're prepared for the wide range of climate possibilities in the future.

How does stratospheric aerosol injection actually work? What is the likelihood that a major nation (or rogue billionaire) might employ this approach in the next thirty years? What ethical, moral, and biophysical concerns should we consider as we weigh the costs and benefits of further altering Earth's planetary balance?

About Ted Parson:

Edward A. (Ted) Parson is Dan and Rae Emmett Professor of Environmental Law and Faculty Director of the Emmett Institute on Climate Change and the Environment at the University of California, Los Angeles. Parson studies international environmental law and policy, the societal impacts and governance of disruptive technologies including geoengineering and artificial intelligence, and the political economy of regulation.

His most recent books are The Science and Politics of Global Climate Change (with Andrew Dessler), and A Subtle Balance: Evidence, Expertise, and Democracy in Public Policy and Governance, 1970-2010. His 2003 book, Protecting the Ozone Layer: Science and Strategy, won the Sprout Award of the International Studies Association and is widely recognized as the authoritative account of the development of international cooperation to protect the ozone layer.

In addition to his academic positions, Parson has worked and consulted for the White House Office of Science and Technology Policy, the Office of Technology Assessment of the U.S. Congress, the Privy Council Office of the Government of Canada, and the International Institute for Applied Systems Analysis (IIASA).

Show Notes and More

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