[stupendousyappi]

This, except for geoengineering. Developing the infrastructure to apply it at planetary scale will take years, and then actually applying it will take trillions of dollars. If by some miracle it turns out to not be necessary, we have plenty of time to cancel it, but now (really, 10 years ago) is the time to start spending 100s of billions of dollars preparing (and 100s of billions reducing emissions, of course).

FWIW, my preferred approach is ocean-powered olivine weathering, as in Project Vesta. But we'll need multiple approaches.