geoengineering explained: the benefits and challenges of space reflectors

Space reflectors, a form of solar radiation management (SRM), are sun shields positioned in space in order to reduce the amount of solar energy reaching the earth. Options include placing mirrors around the earth, placing millions of reflectors between the earth and the sun where the gravitational attraction between the two bodies is equal, launching a “cloud” of trillions of refracting discs or launching a sunshade of mesh aluminum threads.



  • The theorized sun protection would be enough to stop global warming
  • Expensive [estimated at several trillion dollars]
  • Experimental technology with unforeseen consequences
  • Will take 25 years or longer to complete
  • Effects would be uneven with the tropics cooling and the polar regions warming

see also:

Question: What is geoengineering?

Albedo Enhancement

Space Reflectors
Stratospheric Aerosols

Ambient Air Capture
Bioenergy Capture and Sequestration
Ocean Fertilization
Enhanced Weathering
Ocean Alkalinity Enhancement

Physics, I. I., RSC, & Engineering, T. R. (2009, July 15). Geoengineering: challenges and global impacts. Retrieved from