I find it interesting ever more risky way to sequester carbon are invented.

Instead of making adding biochar to farm land an agricultural subsidy. A simple, extremely low risk policy, that is a local subsidy and does create international trade conflicts like other subsidies can.

And it does not affect any wilderness.

And in hot humid climates is proven to increase fertility.

Or a bit risky we could fertilize the open ocean, very significantly increase ocean life. And it has been proven that a significant percentage of fish poop sequesters carbon in the deep ocean.

Instead efforts seem to be focused on shading the sun. And new ideas using nukes....