To understand why the post above is completely wrong, I am reposting my post that explains it.
Why Too Much CO2 is not a good idea.
You may have read that CO2 is “food for plants” and that we should be happy that we are adding more and more of it to the atmosphere. There is a whole association, the “CO2 coalition,” dedicated to pushing the idea that, because of this effect, we shouldn’t do anything to reduce emissions or mitigate global warming. Yes, Earth may get a little warmer, but is it so bad? In exchange, we get “global greening.” Forests grow better and expand everywhere. Even agriculture benefits from more CO2, too.
Alas, it doesn’t work that way. Global greening is over; it stopped at the turn of the century. And now we are fully into “global browning.” It is the exact opposite: forests are suffering, and the whole ecosystem suffers with them. And, to add one more bad thing, the food that agriculture produces is getting poorer in vital nutrients.
The people proposing that CO2 is food for plants are forgetting the fundamental law of ecosystems: “You can’t do just one thing.” All complex systems, and Earth’s ecosystem is one, react to perturbations by a feedback cascade. The results may be good or bad but are always unexpected.
So, global greening was a transient effect. Now, as the increase in atmospheric CO2 concentration continues, other factors are starting to play a role in the system, and their effect is negative on the health of the biosphere.
It is a complex story, but you can read a recent study that highlights the main points of it at:
https://www.science.org/doi/10.1126/sciadv.aax1396
Earth's plants are experiencing a different environment as global warming increases. There is more water in the atmosphere, but, at the same time, the atmosphere becomes drier in terms of "Vapor Pressure Deficit" (VPD), the difference between the saturation pressure and the actual one. The trend is impressive: it started around 2000 -- see Fig 1 of the paper — and it is having consequences.
As typical of complex systems, it is not clear what causes what, but a series of changes are occurring. Because of the higher temperatures, or perhaps because of the higher CO2 concentration (or both at the same time), plants are keeping their stomata close longer. More than they did before the start of the VPD increase. Hence, they evapotranspirate less -- I think what's happening is a negative loop. It was already predicted in 1977 by Rawson et al. (cited in the paper).
A smaller VPD means less evapotranspiration, and less evapotranspiration means less rain, also in terms of the water transported inland by the biotic pump. The land is becoming drier, with rainfall concentrated in short bursts. The consequence is the current "global browning" that's replacing the earlier "global greening." It is not a small thing: forests risk disappearing. The whole ecosystem is at risk. In the meantime, those silly naked monkeys find nothing better to do than kill each other in large numbers. What to say?
It's a complex system and will keep adapting, but that still takes lots of time, measured in human lives.
Oversimplification, to the point of being wrong, is so embarrassing for me to watch, but there it goes again...
Do consider this: https://www.youtube.com/watch?v=V2decDcEJqo&list=PLHSoxioQtwZcVcFC85TxEEiirgfXwhfsw