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Suppose all areas of the Earth is suddenly covered in indestructible mirrors (assume they reflect 70% of solar energy that would hit the land/ocean), how quickly will the increase in albedo cause the temperatures to drop? What temperature would it stabilize at?

I'm mostly looking for rough estimates, like, would the temperature be cold enough solidify gases? Would the cooling take years or centuries to approach equilibrium etc.

If more information/complicating factors can greatly alter the answer, please let me know.

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