Excellent point. And if we put up a big space mirror, and then solve the CO2 problem to get ocean PH back to normal, now our lower solar incidence plus normal greenhouse gas levels will equal temperatures way too cold.

Imagine Keppler syndrome kicks in as a result of building it, and it causes an ice age down here and we lose contact with it and can’t move it.

Now we’re an ice ball with a sky cage we can’t escape.