[Question] If Starship works, how much would it cost to create a system of rotable space mirrors that reduces temperatures on earth by 1° C?

There are many proposed geoengineering solutions that could reduce temperatures on earth. Unfortunately, a lot of them have a mix of side effects and lock-in effects where the changes in temperature come years after deployment which creates risk of unintended consequences.

If we would have a constellation of space mirrors that can be rotated as we desire to let in less or more sunlight, how much would it cost to bring up enough to reduce temperatures on earth by an average of 1° C? Let’s say that Elon’s promise of being able to lunch a Starship that brings up 100,000kg for 1,000,000$ works out, what would it cost to produce and deploy those mirrors?