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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.
Scientists do not know exactly how much oxygen comes from the ocean and how much comes from the trees on land. Some scientists believe that more than one-half of the oxygen comes from the ocean while other scientists say only about one-third of the oxygen comes from the ocean.