Marine phytoplankton are responsible for producing approximately 50% of the Earth's oxygen. Forests and other terrestrial vegetation collectively produce approximately 28% of the Earth's oxygen.
According to National Geo, the Oceans produce 50-85% (meaning they are guessing), the Sub Arctic would produce a tiny fraction.
And nobody is talking about turning the Boreal Forest into a Parking Lot, it is all about strangling the rural economy.
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