Latent heat can be radiated into space, and offset with a relatively small, invisible shade at the earth-sun Lagrange point. 10,000 1km aluminum foil and Mylar sails surfing that point would make earths temperatures completely controllable and would be measurable only as a dimming of the sun imperceptible without sophisticated measuring apparatus.

Starship can carry 2 per trip. Inflatable, polymer hardening, weigh-shift controlled kites gliding just beyond L1 on the solar wind. We would have to launch 3 a day indefinitely, so we would still be encouraged to sort out our CO2 situation.