[water-data-dude]

This took place over ~800,000 years, and a lot of this is theory, but the Azolla event is an interesting parallel. Basically, you had a fast growing fern that was growing in an arctic basin. When they died, they sank to the bottom where conditions were anoxic, so they didn’t decompose and release carbon back into the atmosphere. Azolla was INSANELY good at sucking up CO2 (to the point that over those ~1 million years it might have reduced the CO2 in the atmosphere enough to end the last hothouse period).

I think the issue is that the scale of the problem is so big. This was close to the best case scenario for this kind of sequestration and it still operated on the scale of hundreds of thousands of years. It’s definitely something worth looking into (and I’m pretty sure people are, haven’t kept as up to speed as I’d like though), but we can’t expect it to save us on its own.

https://en.wikipedia.org/wiki/Azolla_event