I think accelerated weathering is the best option: https://www.vesta.earth/ https://www.vesta.earth/ During the Permian extinction CO2 was 3000 ppm - weather

I think accelerated weathering is the best option: https://www.vesta.earth/ https://www.vesta.earth/ During the Permian extinction CO2 was 3000 ppm - weathering rocks is how it was fixed back then. We just need to accelerate that natural process.