“Geoengineering” refers to the intentional intervention in Earth processes for the purpose of mitigating climate change. A controversial topic, geoengineering is typically divided into two categories: carbon dioxide removal and solar radiation management. This second category, also known as SRM, made headlines this summer when the White House released a report that “opened the door” to future research on the topic.

In principle, SRM includes any technology that could be used to reflect some of the sun’s energy from the Earth in order to decrease the amount of associated heating, effectively cooling the planet. And while the study of SRM has mostly been limited to the lab and to date no large-scale experiments have been conducted, more people are calling for the idea to be explored further as global warming increases. At the same time, others are saying the door needs to remain shut, as the potential for unintended political, societal and ecological side effects are just too great.

To help us understand why - why is SRM being considered, and why are people concerned that it is being considered, Climate Now brought together five experts – Professors Frank Biermann (Utrecht Univ.), David Keith (Univ. Chicago), Chukwumerije Okereke (Alex Ekwueme Federal Univ. Ndufu-Alike, Nigeria), Jennie Stephens (Northeastern Univ.), and Claudia Wieners (Utrecht Univ.) – to debate the merits and risks of examining SRM as a possible climate solution.

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