Distributing solid aerosols - Hack

Distributing solid aerosols - Hack

From Reviewer 2 does geoengineering by Andrew Lockley

November 9, 2025 · 60 min

About this episode

Miranda Hack discusses the engineering and logistical challenges of deploying solid aerosols for stratospheric aerosol injection.

Miranda Hack provides an in-depth look at the often-overlooked engineering and logistical barriers to large-scale deployment of solid particles for stratospheric aerosol injection (SAI). She explains how dispersing sub-micron mineral particles at altitude, including challenges like agglomeration, complex nozzle flows, and supply-chain constraints, introduces significant uncertainties and costs. These challenges may reduce cooling efficiency and narrow the design space for “low-risk” SAI strategies, suggesting that solid aerosols could be far less viable than existing models assume. Paper: Hack, M., McNeill, V. F., Steingart, D., & Wagner, G. (2025). Engineering and logistical concerns add practical limitations to stratospheric aerosol injection strategies. Scientific Reports, 15(1), 34635. https://doi.org/10.1038/s41598-025-20447-2 To stay updated on all things SRM-related, subscribe to the Solar Geoengineering Updates newsletter: https://solargeoengineeringupdates.substack.com/

People in this episode

Host: Andrew Lockley

Guest: Miranda Hack

Topics covered

  • geoengineering
  • stratospheric aerosol injection
  • engineering challenges
  • logistical barriers
  • climate intervention

Keywords

  • solid aerosols
  • stratospheric aerosol injection
  • engineering barriers
  • logistical constraints
  • cooling efficiency

Mentioned in this episode

Organizations: Scientific Reports, Solar Geoengineering Updates

Books & works: Engineering and logistical concerns add practical limitations to stratospheric aerosol injection strategies

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