A solution to the climate crisis: mining the moon, researchers say

Bromley and two other researchers considered a variety of properties, including coal and sea salt, that could dim the sun by as much as 2% if fired into space. The team eventually settled on the dust found on the moon, although millions of tons would have to be mined, sifted and loaded into a ballistic device, such as an electromagnetic rail gun, and fired into space each year into order to maintain this solar shield.

But opponents of solar geoengineering, whether on Earth or in space, argue that it is an unhelpful and potentially dangerous distraction from the urgent imperative to transition away from burning fossil fuels.