I may be wrong but isnt most of the tree carbon capture over stated as in the overwhelming majority comes from algae in the oceans?

While forests are great they are not the best focus iirc compared to the oceans.

Yes. A potential method of capture is to seed the ocean with more iron [1], to help the algae.

I assume that China will be the first to do these sorts of things, since the west will be too hogtied in regulations, lawsuits, and bureaucracy.

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		China could definitely do this, to offset the minuscule of the destruction they do with the dark fishing fleets around (and possibly in) protected marine areas.