Most of the CO2 recycling (translation: oxygen production) occurs in the open ocean, in the surface algae.
That doesn't mean we shouldn't continue to find ways to protect the forests from urban incursion and "slash-and-burn" agriculture.
Alleging the existence of a "tipping point", at CO2 concentrations 10% higher than current, ignores the fossil records that indicate that CO2 concentrations have been MUCH, MUCH (as in several times, not several percent) higher in the past.
It also ignores the fact that Mother Nature responds to increased CO2 by growing more plants, both on land and in the water, which reduces the CO2 concentration. (The carbon cycle used to be taught in elementary school science, and again in junior high school life science, and yet again in high school biology. Unfortunately, someone apparently decided that teaching science was politically incorrect.)
The critical chemistry can be summarized (oversimplified) in one line:
6 CO2 + 6 H2O <---> C6H12O6 + 6 O2 + energy
C6H12O6 is carbohydrate (simple sugar). For the biochemistry-impaired: FOOD.
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