I'm guessing you're talking about Azolla[1]. That process was still on the scale of thousands or millions of years. The real problem that humanity is facing her

I'm guessing you're talking about Azolla[1]. That process was still on the scale of thousands or millions of years. The real problem that humanity is facing here is the rate of increase. Even during what was probably the worst extinction event during the Permian-Triassic boundary, where the ppm of CO2 was eventually in the thousands, it still happened orders of magnitude slower than what we are doing artificially releasing the masses of geologically stored carbon. So, Azolla or other natural carbon sinks may simply not work fast enough to counter the rate of increase, let alone the existing extra carbon backlog in the atmosphere. Even if we manage to break even and stop the increase, the planet will continue warming because we've already exceeded the equalibrium that was in place for at least the entire length of existence of our species previously. There would still be ecosystem disruption and ice loss and flooding, but hopefully on a manageable timescale. The sheer quantities here are daunting. 1. https://www.scientificamerican.com/article/can-the-fern-that-cooled-the-planet-do-it-again/ https://www.scientificamerican.com/article/can-the-fern-that...