IIRC terrestrial plants only create ~20% of the worlds oxygen, and this percentage is further reduced with areas being ‘developed’. Not to mention all the land that is used for forestry and agriculture. Plants are growing faster since they can create sugars at higher rates with all the CO2, but I highly doubt it’s enough balance out the potential loss of marine ecosystems. Losing those wouldn’t only affect oxygen levels, but it would also affect any and all animals that depend on those ecosystems as a food source. Thus, plants that rely on animals for pollination or spreading seeds will eventually die off too, leaving only plants that rely on wind even further reducing oxygen production.
IIRC terrestrial plants only create ~20% of the worlds oxygen, and this percentage is further reduced with areas being ‘developed’. Not to mention all the land that is used for forestry and agriculture. Plants are growing faster since they can create sugars at higher rates with all the CO2, but I highly doubt it’s enough balance out the potential loss of marine ecosystems. Losing those wouldn’t only affect oxygen levels, but it would also affect any and all animals that depend on those ecosystems as a food source. Thus, plants that rely on animals for pollination or spreading seeds will eventually die off too, leaving only plants that rely on wind even further reducing oxygen production.