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I don't know much about sunshades, but it looks like the wikipedia article assumes the sunshade would block/filter light across the entire planet. Couldn't we

I don't know much about sunshades, but it looks like the wikipedia article assumes the sunshade would block/filter light across the entire planet. Couldn't we have a significant effect by blocking a small percentage of light during the summer months toward the poles? If we can keep the poles cooler, we could increase the ice cap, reduce melt, and affect only a small number of living creatures. My initial searches have turned up nothing related to this, and I'm a total novice, so just asking the question.

spiralx 7y ago
> If we can keep the poles cooler, we could increase the ice cap, reduce melt, and affect only a small number of living creatures. And more ice means a higher albedo, so more sunlight is reflected back into space. But I see the challenges of partial blocking as a lot higher than in the general case - you need to keep two hemispheres in place and synchronise them with the tilt of the planet as it orbits the sun.