There is a water plant called Azolla that actually captured so much co2 long ago that many think it triggered an ice age. Why not incentivize natural carbon sequestration and just produce huge fields of this stuff everywhere? I would hope we find a fish that likes eating it, or find a way to convert it into other animal feed, if nothing else. I don't think carbon tax credits or whatever they are called are enough for someone to justify making an actual sequestration-only operation.
If an animal eats it, wouldn't it be combusting the captured carbon to produce CO2/H20/energy? I don't think you'd want to feed it to anything, but just let it be buried or be pushed under the earth's crust.
Yes, they don't even need to eat it, just from decomposing versus growing corn you can measure the rising and falling cycles of co2 at different times of the year for north america. I think Azolla is still less effort to grow than most plants, which might still help out if it ends up being used for animal feed.
