No form of carbon capture can offset our current emissions. Also, it's incredibly stupid to use capture for that anyway, as it's always much cheaper to cut the emissions at the source.

Carbon capture is for offsetting historical emissions, and the few niche ones that are so hard to replace that we'll need decades of research.

We can't do it all this way. For every ton of carbon absorbed you add some multiple of that in plankton biomass.

I'm no ocean ecologist, but it seems like there might be several consequences to adding billions of tons of plankton to the ocean