Earth has abundant atmospheric oxygen due to biological photosynthesis
the verdict
SUPPORTED
the evidence backs this
confidence 78/100
Earth's abundant atmospheric oxygen is primarily the result of biological oxygenic photosynthesis, particularly driven by ancient cyanobacteria and marked by events like the Great Oxidation.
Evidence for · 3
An early origin of oxygenic photosynthesis delays the Great Oxidation.
2025 · cited by 2
The study discusses how oxygenic photosynthesis was the biological metabolism that drove the Great Oxidation Event and shaped Earth's atmospheric oxygen history.
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More for · 2
Revisiting the greatness of Earth's great oxidation.
2026 · cited by 1
The review examines the accumulation of free oxygen in Earth's atmosphere resulting from ancient biological processes like the Great Oxidation Event.
Oxygen reductase origin followed the great oxidation event and terminated the Lomagundi excursion.
2026 · cited by 1
The paper notes that cyanobacterial oxygen production initiated the rise of atmospheric oxygen around the Great Oxidation Event.