I don’t know where the link is at the moment, but I’ve heard it said that it would take about one mountain worth of lime, ground up and spread in the ocean to c

I don’t know where the link is at the moment, but I’ve heard it said that it would take about one mountain worth of lime, ground up and spread in the ocean to completely balance out the climate change up to now. I don’t know how much I trust that. The other one that seemed quite viable is using reflective aerosols like sulfur dioxide over the Antarctic. It would circle around in the polar vortex and not have massive effects outside of the South Pole. But cooling Antarctica would add more ice, slow sea level rise, and the ice itself would reflect heat away from the planet. Could be problematic for Argentina/Chile, but probably not so much anywhere else. The potential benefits seem huge.