what’s the idea?
These US-based scientists wrote that the “large amounts of dust” between the Earth and the sun could “limit the amount of sunlight received” by the planet.
The idea is to create something like a barrier that allows part of the radiation to be blocked to mitigate climate change.
The researchers simulated a number of scenarios, including the scattering of dust particles from a space platform located at one of the Lagrangian points, where the gravitational forces between the Earth and the Sun are balanced.
It is likely that this dust thus constitutes a protective barrier, but it can be easily dispersed, which requires re-scattering of dust every few days. Scientists also proposed another solution that they saw as promising, which is the scattering of lunar dust directly from the surface of the moon in the direction of the sun by rockets.
They explained that they had identified “orbits that allow dust grains to provide shade for days.” They explained that the advantages of this method are that this resource is abundant on the Moon, and that it requires less energy consumption than a launch from Earth.
Is it practical?
The researchers acknowledged that the matter is currently limited to exploring the possibility of adopting this solution theoretically, and did not reach the extent of studying the feasibility of this technology.
“We are not experts in climate change or aerospace engineering,” said Ben Bromley, professor of physics and astronomy at the University of Utah, who is the lead author of the study.
Recently, there have been many geoengineering projects aimed at limiting the climate warming that the earth is suffering steadily, but some of them are nothing more than science fiction.
Among the most prominent of these projects is the deliberate addition of suspended particles in the stratosphere to block part of the sun’s rays. But the United Nations has warned that such technology could have negative effects on the ozone layer.
Using lunar dust, away from Earth’s atmosphere, would avoid this problem.
However, the scientific community dealt with the study, which was published on Wednesday, with some reservations.
Confirming that lunar dust could indeed be used as an umbrella, Stuart Hazeldine of the University of Edinburgh stressed that choosing “the right particle shape, the right size and just the right place” is not easy.
As for Joanna Hay of Imperial College London, she said, “The main problem is to suggest that projects of this kind will solve the climate crisis, while giving polluters an excuse not to act,” according to Agence France-Presse.
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