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It is estimated that about 50% of the world's oxygen is produced via phytoplankton photosynthesis. The rest is produced via photosynthesis on land by plants. Furthermore, phytoplankton photosynthesis has controlled the atmospheric CO 2 / O 2 balance since the early Precambrian Eon.
So about 40% of the annual global oxygen production is due to Algae. Stock of Oxygen in Atmosphere. About 20.9% of the atmosphere is Oxygen. This is the level after about 3,500 million years of Photosynthesis. What is the share of algae in the stock of oxygen ? Is it proportionate to the annual production or is it higher or lower ?