I don't think this is actually feasible. [0] suggests you would need a mirror of 600,000 square miles (~700 miles to a side) at the L1 point to block 1% of sola

I don't think this is actually feasible. [0] suggests you would need a mirror of 600,000 square miles (~700 miles to a side) at the L1 point to block 1% of solar radiation. And Lagrange points aren't actually gravitationally stable, you need station-keeping thrusters. Not sure how we'd go about pushing a wall of mirrors the size of France. [0]: https://www.livescience.com/22202-space-mirrors-global-warming.html https://www.livescience.com/22202-space-mirrors-global-warmi...