No, only about half. The other half is created in the oceans by phytoplankton, microscopic single-celled algae. Millions of tons of phytoplankton “bloom” across the world’s oceans every year. Without plants, there are no processes which would keep the atmosphere full of oxygen; non-biological processes could only contribute to there being about 0.5% free oxygen as opposed to the current proportion of roughly 21% of the atmosphere.
According to a National Geographic article, over half of Earth’s oxygen supply comes from phytoplankton – one celled plants that live at the surface of the ocean. All other plants, including trees, shrubs, grass, etc, contribute the other half. So trees only contribute a fraction of Earth’s oxygen.
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