Imagine there’s a cannon on the moon shooting lunar dust into space to help partially shield sunlight to Earth. Space-based geoengineering is filled with creative, sometimes outlandish ideas — but they often aren't seen as feasible.
Yet those ideas have run into myriad issues: Too much material is needed. It would require construction in space. It’s dangerous. Irreversible.“The literature around space-based geoengineering now spans more than three decades and is filled with creative, often outlandish ideas,” Chad M. Baum, a behavioral scientist at Aarhus University who was not involved in the new study, said in an email.
more mass than humans have ever sent into space. Bromley says dust is very efficient at scattering sunlight relative to its size. The team considered different types of dust, scattering properties and size. The team found that aggregates of fluffy and highly porous particles scattered light the best, but they opted for a particle perhaps more easily accessible in space: moon dust.
Baum doesn’t normally find dust clouds to be among the most interesting climate solutions, but he thinks the authors “did an admirable job considering many of the different permutations of a potential approach, and specifically looking at the potential orbits.”
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