There are many ideas for installing sunlight filters to reduce global heating on Earth. Some would place various filters or sunscreens at Lagrange points in the Earth-Moon system where they would be stationary. I would like to add the suggestion that constructing mirrors and polarizing filter screen adjustable units on the moon for easier low-gravity launch into orbit with lower per unit lift cost reach Lagrange Point 1 might be a cost-feasible approach if the construction on the moon is made with automatic robotic 'factories' built on Earth for delivery to the moon.
There are probably innumerable ways of making cad/cam jet-sprayed mirrors on the Moon using lunar materials. An electromagnetic linear mass driver would launch the mirrors off the moon as independent components for assembly at the Lagrange point snapping in to place. The polarizing filtration should allow whatever spectrum of light wavelength in quantatively and qualitatively adjustably as science requires for appropriate reducttion of temperature. This should of course only be used as a last resort, yet of course it would still take a dedicated production program to ready ahead of time.
If the global heating problem is eventually solved by eliminating the surfeit of greenhouse gas emissions, the mirrors out to be moved and relocated for use as a very large reflector space telescope.
image credit: N.A.S.A. Lagrange Points Sun-Earth System with Gravity Field
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