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the claim

Atmospheric CO2 is currently above 400 ppm.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 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 atmospheric CO2 is currently above 400 ppm?

Yes. A peer-reviewed paleoclimate study reports present-day atmospheric CO2 at 412 ppmv, above 400 ppm. Several other sources treat roughly 400 ppm as the ambient or current CO2 level.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 5
Data from: Impacts of silicon-based grass defences across trophic levels under both current and future atmospheric CO2 scenarios
2017
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Data from: Impacts of silicon-based grass defences across trophic levels under both current and future atmospheric CO2 scenarios. (2017). doi.org. https://doi.org/10.5061/dryad.j1d56

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More for · 4
First principles study of Co‐catalyzed MgH2 for CO2 capture and conversion
2023
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*, R. A. S. A. M. S. *. a. A. (2023). First principles study of Co‐catalyzed MgH2 for CO2 capture and conversion. zenodo.org. https://doi.org/10.5281/zenodo.7716116

A 23 m.y. record of low atmospheric CO2
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A 23 m.y. record of low atmospheric CO2. (n.d.). cir.nii.ac.jp. https://doi.org/10.1130/g47681.1

Was the cretaceous the last time atmospheric carbon dioxide was significantly higher than it is today?
2012
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Was the cretaceous the last time atmospheric carbon dioxide was significantly higher than it is today?. (2012). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/8904/was-the-cretaceous-the-last-time-atmospheric-carbon-dioxide-was-significantly-hi

Diverse CO2-Induced Responses in Physiology and Gene Expression among Eukaryotic Phytoplankton
2018
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M., H. G. M., Juan, H. L. M. D. S., Sheean, H., & R., J. A. (2018). Diverse CO2-Induced Responses in Physiology and Gene Expression among Eukaryotic Phytoplankton. doi.org. https://doi.org/10.7916/D8GB3DV4

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