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In the past year, I've covered two different proposals on using space technology to create some sort of "shade" for the entire planet that would save us from global warming. In covering those stories, words like "radical" and even "outlandish" seemed appropriate.
Now, NASA has actually funded a more thorough study of a third "sunshade" proposal. Should I be worried that the government is actually thinking they need some sort of space-based fallback plan for the global warming problem?
The new (third!) sunshade solution is proposed by University of Arizona Steward Observatory optics expert Roger Angel. He suggests that we launch trillions of tiny (0.6 meters across) screens. The screens would be thin transparent disks with little 0.1 meter protruding fins with solar energy-gathering capabilities for position adjustment. The disks would essentially be lenses that would take a small amount of the sun's light (energy) and focus it away from Earth.