In pillar five, I'm really talking about carbon removal, so that would involve carbon sequestration underground after carbon that's already in the atmosphere is removed, for example, through direct air capture.
I do want to emphasize that I agree that this should be a secondary strategy, that at least 80% to 90% of the effort to decarbonize needs to be emissions reductions from sources. In fact, California has passed a law requiring that 85% of the reductions come from emissions reductions from sources, using carbon removal only for the remaining 15%.