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the claim

Wildfires began occurring on Earth shortly after terrestrial plants evolved and atmospheric oxygen rose.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that wildfires began occurring on Earth shortly after terrestrial plants evolved and atmospheric oxygen rose?

Yes. Geological and paleontological evidence confirms that the earliest land plants drove a major rise in atmospheric oxygen during the early Paleozoic, which closely coincided with the earliest appearance of wildfires in the fossil record.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked

The analysis

Multiple papers (e.g., Lenton et al., 2016; Scott & Glasspool, 2006; Wallace et al., 2023) consistently show that as terrestrial plants colonized the land and atmospheric oxygen rose to the threshold required for combustion, charcoal (wildfire evidence) began appearing in the fossil record during the Late Silurian/Early Devonian. There is no evidence refuting this sequence.

Evidence for · 3
Earliest land plants created modern levels of atmospheric oxygen.
2016
Demonstrates that early land plants drove a mid-Paleozoic oxygenation event that raised atmospheric oxygen to modern levels.
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TM, L., TW, D., SJ, D., BJ, M., K, O., MR, S., & P, P. (2016). Earliest land plants created modern levels of atmospheric oxygen.. doi.org. https://doi.org/10.1073/pnas.1604787113

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More for · 2
The diversification of Paleozoic fire systems and fluctuations in atmospheric oxygen concentration.
2006
Shows that charcoal, indicating wildfires, first appears in the fossil record in the Late Silurian alongside rising atmospheric oxygen and terrestrial plant evolution.
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AC, S. & IJ, G. (2006). The diversification of Paleozoic fire systems and fluctuations in atmospheric oxygen concentration.. doi.org. https://doi.org/10.1073/pnas.0604090103

Mercury isotopes show vascular plants had colonized land extensively by the early Silurian.
2023
Indicates that the rapid expansion of vascular plants on land during the early Silurian broadly coincided with rising atmospheric oxygen concentrations.
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W, Y., M, L., D, C., YW, X., RA, S., J, C., 2nd, T. T., X, W., S, L., C, G., G, Z., L, Z., H, Z., & X, F. (2023). Mercury isotopes show vascular plants had colonized land extensively by the early Silurian.. doi.org. https://doi.org/10.1126/sciadv.ade9510

What does the evidence say?

Multiple papers (e.g., Lenton et al., 2016; Scott & Glasspool, 2006; Wallace et al., 2023) consistently show that as terrestrial plants colonized the land and atmospheric oxygen rose to the threshold required for combustion, charcoal (wildfire evidence) began appearing in the fossil record during the Late Silurian/Early Devonian. There is no evidence refuting this sequence.

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8804 Aug 2026
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