Dust as a solar shield

  • Bromley B
  • Khan S
  • Kenyon S
Citations of this article
Mendeley users who have this article in their library.
Get full text


We revisit dust placed near the Earth–Sun L 1 Lagrange point as a possible climate-change mitigation measure. Our calculations include variations in grain properties and orbit solutions with lunar and planetary perturbations. To achieve sunlight attenuation of 1.8%, equivalent to about 6 days per year of an obscured Sun, the mass of dust in the scenarios we consider must exceed 10 10 kg. The more promising approaches include using high-porosity, fluffy grains to increase the extinction efficiency per unit mass, and launching this material in directed jets from a platform orbiting at L 1 . A simpler approach is to ballistically eject dust grains from the Moon’s surface on a free trajectory toward L 1 , providing sun shade for several days or more. Advantages compared to an Earth launch include a ready reservoir of dust on the lunar surface and less kinetic energy required to achieve a sun-shielding orbit.




Bromley, B. C., Khan, S. H., & Kenyon, S. J. (2023). Dust as a solar shield. PLOS Climate, 2(2), e0000133. https://doi.org/10.1371/journal.pclm.0000133

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free