In May 2025, the UK's Advanced Research and Invention Agency (ARIA) announced its initial round of awards for their "Exploring Climate Cooling" programme. The programme will ultimately dedicate £56.8 million to fund sunlight reflection methods research. Some of that funding will go towards field experiments.

There have been only a few SRM field experiments to date, and some have been cancelled due to public pressure. In this episode, we explore what SRM field experiments have taken place, how they've informed scientific knowledge of SRM, talk with some of the scientists leading those experiments, and explore how outdoor field experiments of SRM should or could be governed.

This episode features interviews with:

• David Keith, professor of Geophysical Sciences at the University of Chicago and faculty director of the Climate Systems Engineering Initiative (CSEI), an interdisciplinary academic research cluster focused on climate interventions
• John Moore, glaciologist and research professor at University of Lapland in Finland.
• Daniel Harrison, associate professor in the National Marine Science Center at Southern Cross University in Australia and scientific lead for the cooling and shading subprogram of the Reef Restoration and Adaptation Program (RRAP), which includes outdoor marine cloud brightening experiments.
• Jan MacDonald, professor of Environmental and Climate Law at the University of Tasmania in Australia.
• Shuchi Talati, governance expert and executive director of the Alliance for Just Deliberation of Solar Geoengineering.

Climate Reflections is a production of SRM360, a non-profit knowledge hub supporting an informed, evidence-based discussion of sunlight reflection methods. For more information and the latest research on SRM, visit SRM360.org.

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Africa is home to many of the world’s least developed nations and its population is rapidly growing, making it one of the most climate vulnerable regions in the world. As such, Africa has much to gain, or lose, from the potential deployment of SRM. SRM360 hosts a live panel discussion at the Degrees 2025 Global Forum in South Africa with leading African experts about the future of Africa, the climate outlook, and the potential and risks of SRM for the continent.

Moderator: Pete Irvine (SRM360.org & University of Chicago)

Panelists:

• Babatunde Abiodun, University of Cape Town, South Africa
• Ernest Ofori, Green Africa Youth Organization, Ghana
• Nana Ama Browne Klutse, Environmental Protection Authority, Ghana
• Portia Adade Williams, Science and Technology Policy Research Institute, Ghana

Climate Reflections is a production of SRM360, a non-profit knowledge hub supporting an informed, evidence-based discussion of sunlight reflection methods. For more information and the latest research on SRM, visit SRM360.org.

Follow us to stay updated on the latest episodes:
LinkedIn: SRM360-org
Twitter/X: SRM360_org
YouTube: SRM360org
Bluesky: SRM360

And subscribe, wherever you get your podcasts!

In this episode of Climate Reflections: The SRM360 Podcast, host Dr. Pete Irvine discusses the sunlight reflection method (SRM) known as Marine Cloud Brightening (MCB), which involves spraying sea salt particles below the cloud base to brighten clouds and reflect sunlight. The episode explores two different MCB field experiments by scientists, and discusses the technical, scientific, and ethical challenges of MCB.

Joining us to explain Marine Cloud Brightening are experts Dr. Isabelle Steinke, Assistant Professor for Climate Engineering at TU Delft, Dr. Michael Diamond, Assistant Professor in Earth, Ocean, and Atmospheric Science at Florida State University, and Dr. Daniel Harrison, Oceanographer and Engineer at the National Marine Science Centre of Southern Cross University and Cooling and Shading Leader for the Reef Restoration and Adaptation Program in Australia.

Climate Reflections is a production of SRM360, a non-profit knowledge hub supporting an informed, evidence-based discussion of sunlight reflection methods. For more information and the latest research on SRM, visit SRM360.org.

Follow us to stay updated on the latest episodes:
LinkedIn: SRM360-org
Twitter/X: SRM360_org
YouTube: SRM360org
Bluesky: SRM360

And subscribe, wherever you get your podcasts!