Turns out the CO2 effect on plants is less than modeled

[Old Rocks]

The increased plant growth from added CO2 is less than modeled because of the inaccuracies in the modeling assumptions. The nitrogen fixation processes in forests and grasslands are not as great as modeled, so restrict the amount of CO2 that the plants can process. That increases the gap between what we are producing and what the planet can absorb, which means a more rapid buildup of GHG's in the atmosphere;

 

[Woodznutz]

"Limiting nutrients". If any single nutrient is lacking, it affects the absorption of others. Hell, we learned that in grade school.

 

[flack]

You forget the most important plant.


Marine algae absorb vast amounts of carbon. Collectively, microscopic algae (phytoplankton) fix about \(50\text{ billion tons}\) of \(\text{CO}{2}\) annually, accounting for roughly half of all planetary carbon fixation. On an individual level, microalgae sequester carbon \(10\text{ to }50\text{ times}\) faster than terrestrial plants, absorbing about \(1.83\text{ kg}\) of \(\text{CO}{2}\) per \(1\text{ kg}\) of dry algal biomass