Enhanced weathering experiments indicate that slreading basalt dust over agricultural land in quantities roughly equal to iron tailings (a large portion can be thise exact iron tailings as it is often basalt hosted) would sequester 1ppm per year whilst improving yields. It is not enough to offset current activity, but it is enough to bring levels down to something less bad in fairly short order.

This is just one of many possibilities.

The last resort one is iron seeding the lowest-life portions of the pacific. It is proven to work at many times higher scale for much lower cost, but the potential harms are not yet fully understood.