Could this affect the global climate?
I suspect that the answer is yes, depending on scale. The sun is no longer heating the earth as muchg, so local temperatures will be depressed by some small amount. The greenies love to agonize over tenths of a degree, so this should get them going, if anyone gets their attention.
Might affect the local, since it’ll be reflecting heat that would otherwise warm the soil... which could change the soil conditions just enough to allow some weeds to grow under the partial shade of the mirrors, if there is any condensation at all....
That’s up to the progressives.